Ch4-KistB

Bryan Kist's Wikilog - Period (6) CP Physics - (E. Burns) - 2010

toc =Section 1=

Roller Coasters [|The corkscrew]- cedar point- this coaster has several important features which make it fun, the corkscrew being the most important is there to make you feel confused and not know which direction is up, this also makes the velocity you are going at increase because GPE becomes KE [|Kingda Ka]- great adventure- This is on the the fastest coasters on earth and that is why it is so good. the Kingda Ka accelerates from 0-206km/h in 3.5s. The large tower is at 456 ft and that means there will be a lot of GPE at the top, when on the way back down that GPE is turned back into KE and the ride will continue to move very fast.

What do you see - A girl pushing a boy and pretending for it to be a roller coaster and it changes direction many many times What do you think- The part that is the scariest would be the way down because that is when you are going the fastest.

Physics Talk - Scalar- A quantity thats has magnitude but no direction - Displacement, is the difference of the final placement and the initial placement of an object - Vector- a quantity that has both magnitude and direction - Acceleration is the change in velocity divided by the change in time - Velocity of an object given a certain direction

Checking Up 1. Distance is how far something travels, but displacement is the difference between its final placement and initial placement 2. The displacement is 0 because you started where you finished 3. speed is how fast you are going at a certain point, but velocity is speed and direction 4. take the change in velocity and divide it by the change in time.

Physics To Go 1.



2. The biggest thrill would be where the roller coaster makes the biggest change of motion or speed. This is because it is the most unexpected 3. La Paz has the greater speed because it is going the larger distance in the same amount of time b. you are going 1667 km/h c. and the reason that you are not getting a big thrill is because you are going at a constant speed 4. 16-4= 12/3= 4m/s^2 5. a- Speed b- Velocity c- Velocity and Accelerating d- Displacement and Velocity e- Displacement 6. v=d/t v=.1/2= .05m/s 7. .05=.05/t= **1s** **8.** a=V/t, a=Vf-Vi/t so 25/10= 2.5m/s^2 10. a. one change that i would make would be that there wouldn't be that big of a hill, and there would be no great changes of direction in order to make it less scary for the preschool students. b.

What Do You Think Now The part of the ride that would create the loudest screams would be the parts that have the greatest change of motion or velocity, meaning that you would either feel heavy or light. The parts that would change the greatest acceleration would be the clothoid loops, the back curves, and the horizontal loops.

=Section 2= What do you see- The people in the cart that is going slow and straight are bored while the people going down the steep slope are having fun What do you think- the ride that has the steeper angle will be the ride that produces the greater thrill.

Physics Talk- Gravitational Potential Energy- The amount of energy an object has based on its position in a gravitational field Kinetic Energy- The Energy an object has because of its speed Joule is the SI unit for all forms of energy; equivalent units of the joue are N*m Mechanical energy is the sum of kinetic energy and potential energy

Checking up Questions 1. The longer the incline is the faster the ball will be going at the bottom because as GPE decreases KE invreases 2. The higher the ball is and the more mass it has, the greater the GPE will be, the less mass and height is has there will be less GPE 3. The more speed and mass the object have it will have more KE and the less speed and mass it has it will have less KE. 4. As the rollercoaster loses GPE, all of the GPE that is lost is transformed into KE 5. When the car is 3/4s of the way down the track it will have 30,000J of KE, because only 3/4th of 40,000J is lost.

Physics To Go 1.They will both be the same because they are at the same height.

3. 4.
 * Height(m) || GPE || KE || GPE+KE ||
 * Top (30m) || 60,000J || 0J || 60,000J ||
 * Bottom(0m) || 0 || 60,000 || 60,000J ||
 * halfway down (15m) || 30,000J || 30,000J || 60,000J ||
 * three quarters down (7.5m) || 15,000J || 45,000J || 60,000J ||

5. 12.5m || 37500J || 37500J || 75000J || 5m || 15000J || 60000J || 75000J || 6.
 * height || GPE || KE || GPE+KE ||
 * top 25m || 75000J || 0J || 75000J ||
 * bottom 0m || 0J || 75000J || 75000J ||
 * halfway
 * further

7. a. GPE=mgh, .75m*.2kg*9.8, GPE=1.47J b. GPE=KE, 1.5=1/2(.2kg)*v^2, V=3.9m/s c. GPE and KE will be the same at .375m

8. The speed of the car will be the same because the masses will cancel out, mgh=1/2mv^2

9. a. The coaster is traveling fatest at point B because this is at the bottom at a hill which means more KE  b. it is traveling the same speed at points C and F because they are at the same height meaning there will be an equal amount of KE  c. it is traveling faster at point D because it is lower that point E, meaning that there is more KE and a greater velocity than at E where there would be more GPE

10b. The roller coaster cannot reach point H because it is higher than the point it started out, that would mean it would gain GPE because of the increased height.

11.
 * position || height || GPE || KE || GPE+KE ||
 * bottom || 0m || 0J || 50,000J || 50,000J ||
 * top || 25m || 50,000J || 0J || 50,000J ||
 * top of loop || 15m || 30,000J || 20,000J || 50,000J ||
 * horizontal loop || 0m || 0J || 50,000J || 50,000J ||

What do you think now My initial answer was wrong because Both of the roller coasters will have the same thrill. This is true because they both start at the same height and will have the same speed at the bottom of the track. The only difference is that now i know, Track B, since it is steeper will have a greater acceleration and possible making is more exciting.

=Section 3= what do you see? there is a frog that is being launched off the table and his height is being measured, and a girl in the back round calculating SPE, GPE, and KE what do you think? Today one way that a roller coaster gets up the hill is that there are a chain of magnets that continually push and pull the car to get it up to high speeds. I think that it would cost more to lift a car full of people because it would take more energy to lift them up the hill.

Physics Talk - Conservation of Energy Spring potential energy- is the energy that is stored in a spring when it is stretched or compressed As a car is on top if a hill it has maximum GPE but as it goes down the hill the GPE becomes KE SPE= 1/2kx^2 GPE+KE+SPE=constant

Checking Up 1. The spring potential energy is transformed into GPE because as it gets higher it loses the SPE and it is turned into GPE 2. It will have 2J of KE right after take off because the SPE is immediately converted into KE 3. If the spring toy has 2J of SPE before take off, it will have 2J of GPE at the top of the launch because SPE must equal GPE. 4. the two factors that determine the SPE are the spring constant and the amount of stretch or compression it has.

Physics To Go 5.If the second hill would be bigger than the first hill, then that would mean there is more GPE at the top of the second hill than the first 6. It is because friction, if there was no friction then the cart would never stop and continue to go over hill after hill 7. GPE=mgh, so 300*15*9.8= 44100J 8. KE=1/2mv^2, so (200)(15)^2= 45,000J b. GPE will be 45,000 at the top where KE is 0 c. GPE=m*g*h, so 45000=400*9.8*h, h=11.5m 9. The GPE is increasing because it is increasing height meaning more GPE 10. All three will be the same because even though some paths are longer, they all finish in the same spot 11a. Yes, GPE is equal to .0784J, And KE is equal to .0724J b. SPE=GPE, so SPE is equal to .0784J c. we would expect the height to be .13m 12a. GPE=KE, so 52920J=1/2kx^2, so 52920=1/2K*(4^2), 52920=1/2k*16, so k=6615 b. 70560=1/2(6615)(x^2), so 4.62m=x 13. SPE=KE, 1/2k*x^2=KE, 1.8J=KE

What do you think Now - One way that a roller coaster gets pulled up the track is by a chain, the total force it uses to pull up the cart must remain the same through out the entire ride.

= Section 4 = What do you see - there are 2 roller coasters, one is on the moon and the other is on Jupiter, the one on Jupiter is more fun than the on on the moon What do you think - Gravity has a direction and it is down because when there is gravity, we are constantly being pushed down by it other wise we would float up if we jumped.

Physics Talk - a gravitational field is the gravitational influence in the space around a massive object - inverse-square relationship describes the relationship between the magnitude of a gravitational force and the distance from the mass it is. - Newtons Law of Universal Gravity- states that every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them- equation- Fg=G*m1*m2/r^2, where r is the distance between their centers, m1 and m2 are the masses of the bodies and G is the universal constant equal to 6.67*10^-11N - Gravity is the force of attraction between two bodies according to their masses. - Kepler’s first law: The planets travel in ellipses about the Sun. An ellipse is a mathematical shape that is defined by two foci. The Sun is at one focus. There is nothing at the other focus. - Kepler’s second law: The planets sweep out equal areas in equal times. Imagine a pizza in the shape of an ellipse. Slices of pizza are cut from one of the foci. Each slice of pizza has the same area. The planets would travel along the edge of the ellipse. The time needed to travel along the edge of each slice of pizza would be identical. Since the edge of the pizza represents the path of the planet around the Sun, this means that the planet travels faster when it is near the Sun and slower when it is further from the Sun.where T is the time to complete one orbit and R is the average distance from the Sun. - Kepler’s third law: There is a mathematical relationship that defines the time it takes for a planet to complete an orbit about the Sun and the average distance of the planet from the Sun. - the Cavendish experiment was a test done by Henry Cavendish where he used a few several KG masses and used a tiny twist of quartz fiber to suspend them. This proved that Gravity was universal.

Checking Up 1. The direction of the gravitational field in our classroom is down. 2. the gravitational field is strongest there the field lines are closest, or closer to the object. 3. you make the force of gravity 1/9th as large 4. the earths gravity holds the moon in orbit 5. it is eliptical

Physics to Go 1. the force would be 125N

2a. it would be 1/4 of what it was 2b. it would be 1/9th of what it was 2c. it would be 1/16th as much

3. Gravity id trusted because it is what keeps us on the ground, and the moon in orbit, if there was no gravitational pull from the earth, we would float and the moon would not stay in orbit.

4. the gravity would be greater at the bottom of the ride because it is closer to the center mass meaning that there will be a smaller denomenator meaning a grater force.

5a. the water is closer to the moon than the earths center 5b. the reason that high tides are on the side of the moon is because it is caught between the two gravitational fields being pulled higher 5c. there is more water on the sides because these points are closer to the moon than the top or bottom

6. the fishes life would be different because the gravity wouldnt be there to keep it from staying in place 6b. yes gravity holds the fish down because with out it both the fish and water would float

7a. it would be 1/4th as great b. it would be 1/9th as great c. it would be 1/16th as great d. it would be 4 times as much

8a. the force would double b. the force would tripple c. the force would quadruple d. the force would be cut in half

9a. the force would be 4 times as much b. the force would be 9 times as great c. the force would be 16 times as much d. the corce would be 1/6th as much

10a. the force would be doubled b. the force would be 9 times as much c. the force would be 6 times as much

Physics plus 1. A=v^2/r 2. v=d/t, so (2)(3.14)(3.84*10^8)/2440800 so v=998.5m/s 3. A=v^2/r, so a=998.5m/s^2/3.84*10^8, A= .0025m/s^2

What Do You Think Now - Gravity does have a direction and on earth it is down. this is because the earth pulls on us otherwise we would float away. It is irrelevant that the people in Australia are upside down because gravity pulls us toward the center of the earth.

= Section 5 = What do you see- in the fist picture they are in a deli, and using a regular scale, in the second one they are using a spring scale. What do you think- No, you cannot use the same scale in order to weight both the elephant and the canaries because you will need a much more fine scale in order to read its true weight.

Physics Talk Hooke's Law- states that the restoring force exerted by a spring is directly proportional to the distance of stretch or compression of the spring. - this can be expressed in the equation, Fs=-kx, where F is the spring force, k is the spring force constant, and x is the distance the spring is compressed or stretched - Weight is Mass*Gravity, weight is also a force, because gravity is acceleration - The greater the spring constant, the harder it is to stretch or compress the spring. - The slope of a graph is the spring constant

Checking Up 1. If the force on the spring is increased by 5x, then the distance must increase by 5x 2. The spring constant tells us how easy or difficult it is to compress or stretch a spring 3. The weight of the object in Newtons, is always more than the mass, because you must multiply the mass by 9.8 to get the weight. 4. The force of compression is the same as our weight other wise the scale would be wrong.

Physics To Go 1a. 100kg*9.8= 980N b. 10kg*9.8= 98N c. 60kg*9.8= 588N

2a. 520N b. 4000N c. 200N

3c. The slope is y=.1491x d. this means that as y increases 1, x is 14.9 times that. d. the slope of the graph is also the spring force constant 4. 12N/3m= 4N/m 5. "as the force, so the stretch" is describing the relationship a spring has between the force and the stretch distance. The Force is directly proportional to the stretch distance for the spring. 6. The spring that has 15N/cm is harder to stretch because it takes a greater amount of force to stretch it the same distance. 7. it is about 1.5N/cm, i got this number because the slope of the graph is the spring force constant. 8. The way a wpring scale works is means that as you step on it, the spring is stretched, and it it calibrated like the one we made in class, to know how far the spring stretches and make a very good guess to how much force it applied.

What Do You think Now - you cannot use the same scale to weight an elephant and a Canary because the scale that measures the canary must have a much less spring force constant in order to get an accurate measurement. you will need a spring with a much larger spring force constant because you are dealing with a much larger mass.

= Section 6 =

What do you see - there is a big guy that is going down in an elevator and his apparent weight is 0, but there is a tiny kid going up in an elevator and his apparent weight is much more than it should be. What do you think- Yes your weight does change because when you go up, you continue to move up as the car moves down, the scale would change because it could move down as you keep moving up, making your weight appear less than it actually is.

Physics Talk - A object in motion stays in motion and an object at rest stays at rest unless acted upon by and unbalanced force. - Unbalanced force creates acceleration, or the bigger force is in the same direction as accelerations - F-net=m*a - INCREASING SPEED: VELOCITY AND ACCELERATION POINT IN THE SAME DIRECTION!!! - DECREASING SPEED: VELOCITY AND ACCELERATION POINT IN OPPOSITE DIRECTIONS!!! - FORCE AND ACCELERATION ALWAYS POINT IN THE SAME DIRECTION!!! - THE BIGGER FORCE IS IN THE SAME DIRECTION AS NET FORCE!!!

checking up 1. Net force is zero because acceleration is zero 2. it would increase because you are accelerating up 3. it is because the normal force is greater than weight 4. it should read zero because you are falling at the same rate as the elevator. 5. air resistance

Physics to go 1. Vi=0, Vf=Vi+at so Vf=0+at a. Vf=9.8*2= 19.6m/s b. Vf=9.8*5= 49m/s c. Vf=9.8*10= 98m/s

2. Vf=Vi+at, Vi=0 a. Vf=1.6*2= 3.2m/s b. Vf=1.6*5= 8m/s c. Vf=1.6*10= 16m/s

4. Section 6, PTG #4
 * **Motion of the Elevator** || **Acceleration (up, down, zero)** ||  || **Relative Scale Reading (greater, less or equal to weight)** ||
 * At rest, bottom floor || Zero ||  || Equal to weight ||
 * Starting at Rest, Increasing Up || Up ||  || Greater than weight ||
 * Continuing to move, Constant Up || Zero ||  || Equal to weight ||
 * Slowing down to top floor, Decreasing Up || Down ||  || Less than weight ||
 * At rest, top floor || Zero ||  || Equal to weight ||
 * Starting at rest, Increasing Down || Down ||  || Less than weight ||
 * Continuing to move, Constant Down || Zero ||  || Equal to weight ||
 * Coming to a stop on the ground floor || Up ||  || Greater than weight ||

5. The motion is either deceasing up or increasing down because this means acceleration is negative meaning down, making your apparent weight smaller than it actually is. 6. The velocity is up and the acceleration is up meaning that the passengers apparent weight will increase 7. a. The scale will read less than what it does now because acceleration is down. b.F=ma, so F=50*1.5= 75N, so 490-Fscale=75, so the scale would read 415 8. 50kg*9.8m/s^2= 490N b. F=ma, so N-mg=ma, N=50(2)+490, N=590N c. it would read 490 because there is no acceleration 9. In the first sketch, the elevator is either at rest or moving in a constant speed with no acceleration. b. in the second sketch, acceleration is down, meaning that the weight is greater than the normal force so the apparent weight is less c. In the third sketch, the elevator is accelerating up, so the Normal force will be greater than the weight meaning that the apparent weight is greater 10.

What Do You Think Now - Your actual weight does not change but your apparent weigh does because of the direction of acceleration, if you are accelerating up, your apparent weight will feel greater than your weight because normal force is greater than weight, and if you are accelerating down, then you feel lighter because weight is greater than the normal force. If you were at the bottom of a hill, then you would feel heavier because acceleration is up.

=Section 7= What do you see- there is a roller coaster with 4 carts and one is going up, one is going down the hill, one is in the top of a vertical loop and the last is going around a curve and almost falling off. What do you think - you don't fall out of a roller coaster cart because you are getting pushed to the outside of the circle because you want to keep moving in a straight line.

Physics Talk Centripetal force is one that points to the center of the circle, it can either be normal, tension, weight, or friction forces. tangential speed is usually constant Centripetal acceleration is always toward the center of the circle. Ac=(v^2)/r where, v=velocity, and r=radius

Checking up 1. Centripetal force keeps you moving 2. yes, centripetal acceleration 3. GPE and Normal Force 4. Normal force is responsible for apparent weight 5. - It is larger when speed is increased - Larger when mass is increased - and larger when the radius of the circle is shorter

Physics To Go 1a. If the loose end of the string is held to the ground then the car would travel in a circle b. The car would travel tangent to the circle

2a. The force that replaced the string would be friction b. If the car hit a patch of ice, it would also travel tangent to the circle

6a. No it is Still 20m/s b. Yes, since there was a change of direction there was a change in velocity c. A^2+B^2=C^2 20^2+20^2=C^2 C=28m/s Sin(Theta)=20/20, theta= 45degrees - It is going 28m/s @ 45degrees NW

7. Ac=(V^2)/r Ac=20^2/200 Ac= 2m/s^2

10.Fast moving roller-coaster
 * || Required Centripetal Force || Force of Gravity (weight) || Normal Force ||
 * At the top of the loop || 4000N || 500N || 3500N ||
 * At the bottom of the loop || 6000N || 500N || 6500N ||

Slow Moving Rollercoaster
 * || Required Centripetal Force || Force of Gravity (weight) || Normal Force ||
 * At the top of the loop || 800N || 500N || 300N ||
 * At the bottom of the loop || 2800N || 500N || 3300N ||

13. a- Bottom of Hill 1= normal b- Top of Vertical Loop= heavy c- bottom of vertical loop= heavy d- bottom of hill 2= uncertain e- Lift= normal

14. a- Bottom of hill 1= zer**o** **b- Top of vertical loop- down ** **c- Bottom of vertical loop- up ** **d- Bottom of hill 2- zero ** **e- Lift hill (going up at constant speed)- zero ** ** f- Horizontal loop- sideway s ** **g- Back curve- sideways **

Physics Plus 1. the Fnet would increase as well since it is a direct proportion b. it would also increase because it is a direct proportion as well 2. if you double the speed, you would need it to be 4 times as strong since it is a square relationship. 3. it decreases since its an inverse relationship. 4. the larger the radius of the curve, the smaller the force needed to keep the car moving 5. The stopper would travel tangent to the path of the circle

What do you think now - you don't fall out of a roller coaster because there is centripetal force and acceleration and the only was you would fall out is if it stops accelerating. Also since you are traveling in a circle, inertia wants you to travel tangent to the circle keeping you pushed to the seat.

=Section 8= What Do you See What do you think

Physics Talk -Work: the product of displacement and the force in the direction of the displacement; the energy transferred to an object Power: the work done divided by the time elapsed; the speed at which work is done and energy is transferred Watt: the SI unit for power; 1 W = 1 J/s

Checking up 1. GPE is at the top 2. The work is due to the GPE of the cart at the top 3. power decreases over time 4. it is converted to work or EPE 5. The watt

Physics To Go 1. a - At the top all fo the energy is GPE b- GPE/h c- GPE=EPE, all of it d. EPE=1/2kx^2 e. GPE f. when you touch the spring you begin to slow down

2a. no acceleration b- W=f*d 60(1/2)= 30W c- W=f*d 40(75)= 3000W d- W=f*d 500(.7)= 350W

3.Electrical energy is expensive and doesnt stay within the system

4. it has to be heavier so the energy could bring it to the top

5. W=GPE W=10000(20) W= 200,000J B) P=W/T P=200,000/150  P=1333.3J

What do you think now -

=Section 9= what do you see- there is a roller coaster in the background and the girl is thinking about energy and doing well while he is thinking about force and cant do anything what do you think- The parts of the snake are where the ride changes direction from left to right. If the speed stays the same then it will still be fun because you are changing direction.

Physics Talk - scalar quantities are energy, or a measurment that has no direction - vector - are measurments that have a direction, a force is scalar because is it has direction - vectors at right angles- use the Pythagorean theorem - best time to use energy is when you have heights and velocities - Law of conservation of energy states that all energy cannot be created or destroyed, but only tranformed from one form to another - total mechanical energy (GPE+KE) is the same at every point - If something is complex, then scientists will think of energy first since it includes the ease of simple addition - when something is asked about time, scientists think about forces and acceleration since acceleration is the change in velocity with respect to time

Checking Up 1. Pythagorean theorem 2. energy is scalar, and force is vector 3. GPE, KE, and total energy 4. it doesn't depend on the path 5. Change in the height of the rollercoaster

Physics To Go #1-7 1a.in Notebook b. a^2+b^2=C^2, 50=c^2, C=7m/s SouthWest

2. Even though the track to the right would have a faster acceleration, they have the same change in velocity because they both have the same GPE, which means the same KE and therefor the same velocity at the bottom.

3. Distance- Scalar Displacement- Vector Speed- Scalar Velocity- Vector Acceleration- Vector Force- Vector KE- Scalar GPE- Scalar Work- Scalar

4. a. Mark traveled 30Km- Scalar b. Maia's Weight is 600N- Vector c. The rollercoaster had a KE of 1200J- Vector d. 30M/s toward the center of town- Vector

5. When a rollercoaster is going in a bunch of curves and zags, its easier to think of energy, but when it is going in a straight path it is easier to refer to force

6.in Notebook

7.in Notebook

NOTE BOOK WORK

What Do You Think Now- rides are exciting to the people because the ride is either changing direction or accelerating, if a ride is going at a constant speed, it can be still be thrilling because of a change in direction, and vice versa.

= Section 10 = What do you see?- this roller coaster needs to be fixed because there are portions of track missing and it is accelerating to fast. What do you think? -if death was a high possibility on a roller coaster then i would not ride it.

Physics Talk - safe acceleration is up to 4g's - Centripetal acceleration V^2/R, where V=velocity, and R= the radius of the circle - in order to lower the acceleration, you can make the radius larger, lower the velocity by lowering the height, and drop the bottom of the loop.

Checking up 1. The maximum amount of safe acceleration is 4g's 2. you can make the radius larger, or lower the velocity by lowing the height 3. the acceleration is greatest at the bottom of the loop 4. Normal force is also greatest at the bottom of the loop

PTG 2a.GPE=KE mgh=1/2mv^2 9.8h=200 h= 20m

2b.a=v^2/r a=20^2/3 a=400/12 a= 33m/s^2

2c. NO

2d. 22m/s

2e. 17m/s

3a. a=V^2/R a=25^2/10 a= 63m/s 3b. yes

4a.GPE=Ke mgh=1/2mv^2 9.8*50=1/2V^2 v= 31m/s

4b. a=v^2/r a=31^2/10 a=961/10 96m/s

4c. GPE=GPE+KE 50*9.8=9.8*20+1/2v^2 588=v^2 v= 24m/s

4d. a=v^2/r a= 576/10 a=58m/s^2

4e. yes because the g's do not exceed 4

5a. 8.9m/s 5b. 20m

6a. 8m/s 6b. 7200N 6c. track on wheels

7a. 26.7m/s^2 7b. 24000N

Physics Plus

1/ GPE=KE 9.8h=450 h- 45.9m

1b. Ac= V^2/R Ac= 100m/s^2

1c. 100m/s^2 / 9.8 = 10g's which is not safe

1d. 39.2m/s^2 = v^2/R 352.8=V^2 v= 18.8m/s^2

1e. 39.2m/s^2=V^2/R 274.4=V^2 v= 16.6m/s

1f. GPE=GPE+KE 273.42=1/2v^2 v=23.4m/s

1g. a=V^2/R Ac= 60.2m/s^2 = 6g's which is not safw

1i. N+W= MAc V^2/9= 9.8 v=9.4m/s

2. W=mg w=9800N N-W=ma N=9800N

3a. sharp left turn- N>9800N, N=MAc+W sharp Left turn while the car is on its side, N>9800N, N=MAc-W Vertical Loop, N<9800N, W-N=MAc

4. Fc=mv^2/r Fc= 18,800N 5. Fc=mv^2/r = 18,800N

6a. Fc= mv^2/r = 18,800N

6c. W=mg, = 9800N 6d. N-W=mv^2/r N-9800=18800 N=28,600N

What Do you think now - i do think it changes the thrill of the ride because the people know that