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Name_____________
Physics: Circular Motion
Centripetal Force
What is centripetal force?
What are the units for centripetal force?
What is the equation for centripetal force?
Mass?
Distance?
Velocity?
Follow along on the board!
What force is needed to turn a 1200kg car around a corner with a radius of 10m if the car is going
24m/s?
If it takes 44N of force to hold the 1.5kg tetherball in place on the end of the 5m string, how fast is it
traveling?
A 13,000kg airplane requires 9,000N of force to execute a turn moving 110m/s, what is the radius of
the circle it is following?
Practice: Remember your steps!!!! 1. Write the equation. 2. Use units to substitute the correct number
for the variable. 3. Solve for the unknown using correct algebra. 4. Include units with your answer
1. Fcent = ?
m = 22 v = 74 r = 24
2. Fcent = 22
m = ? v = 74 r = 24
3. Fcent = 74
m = 22 v = ? r = 24
4. Fcent = 24
m = 22 v = 74 r = ?
5. What force is needed to turn a 750kg car around a corner with a radius of 12m if the car is going
43m/s?
6. The centripetal force required to turn a 17,000kg plane around a 450m arc is 54,0000N, how fast is
the plane traveling?
7. A rock is on the end of a 3m string spinning at 25m/s. The centripetal force is 38N, how much is
the rock’s mass?
8. A 2 kg ball in a slingshot is moving in a circle at 5 m/s with a force of 20 N. How long is the string?
9. What is the centripetal force of a 900 kg plane moving in an arc with a radius of 300 m at 500 m/s?
10. What is mass of a ball in a slingshot moving at 6 m/s with a force of 15 N if the string is 2 m?
11. How long is the tetherball string if the 2 kg ball moves at 5 m/s with 5 N of force?
12. How fast does a 200 kg car move around a corner with a radius of 12 m if the force is 40 N?
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Name_____________
Physics: Circular Motion
Centripetal Acceleration
What is centripetal acceleration?
What is tangential velocity? How is it difference from regular velocity?
What are the units for centripetal acceleration?
What is the equation for centripetal velocity?
Distance?
Tangential velocity?
Follow along on the board!
What is the centripetal acceleration of an object whose velocity is 33m/s following a 21m arc?
An airplane following a 204m arc has a centripetal acceleration of 880m/s2, what is its tangential
velocity?
A bucket is being swung from a string in a circle at 40 m/s with an acceleration of 50 m/s2. What is the
length of the string?
Practice: Remember your steps!!!! 1. Write the equation. 2. Use units to substitute each variable for a
number. 3. Solve for the unknown using correct algebra. Include units with your answer.
1. Acent = ?
v = 15 r = 9
2. Acent = 24
v=?
3. Acent = 10
v = 74 r = ?
r = 12
4. What is the centripetal acceleration of a plane moving in an arc with a radius of 200 m and a
tangential velocity of 400 m/s?
5. Keys on a long keychain are swung with an acceleration of 10 m/s2 and a velocity of 5 m/s. How
long is the keychain?
6. What is the tangential velocity of a ball moving on a 2 m string at 40 m/s2?
7. An airplane following a 107m arc has a centripetal acceleration of 600m/s2, what is its tangential
velocity?
8. What is the centripetal acceleration of an object whose velocity is 10m/s following a 40m arc?
9. A ball on a string has centripetal acceleration of 15m/s2, if its tangential velocity is 5, what is
the length of the string?
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