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U5 – WS 2 – Uniform Circular Motion
CP Physics
Unit 5 – Projectile Motion, UCM, Gravitation
1. For an object moving in uniform circular
motion, is the velocity constant? Is the speed
constant? Explain.
2. For an object moving in uniform circular
motion, what is the direction of its velocity?
What is the direction of its acceleration?
3. An unbalanced force must act on an object for it
to move in uniform circular motion. Describe at
least 3 examples of uniform circular motion and
identify the object that exerts the unbalanced
force on the object that is moving with uniform
circular motion.
4. What does the word centripetal mean and what
does “centripetal” describe about a force?
5. A string's tension force supplies the centripetal
force needed to keep a yo-yo whirling in a
circle.
a. What supplies the centripetal force keeping
a satellite in uniform circular motion around
the Earth?
b. What kinds of forces keep a roller coaster
held to a looping track?
6. Can a normal force, gravity or tension be in the
“centripetal” direction and cause an object to
move in circular motion. Provide examples
showing why or why not.
7. A toy train travels in a circular path with radius
of 0.20 meters with a speed of 3.0 meters per
second. What is the centripetal acceleration of
the train?
8. A daredevil bike rider goes around a circular
track. The circular path has a radius of 15
meters, the mass of the bike a rider is 180 kg,
and the speed of the bike & rider is 25 meters
per second. What is the centripetal force on the
bike & rider?
9. A runner rounds a circular curve of radius
24.0 m at a constant speed of 5.25 m/s. What is
the magnitude of the runner's centripetal
acceleration?
10. An astronaut in training rides in a seat that is
moved in uniform circular motion by a radial
arm 5.10 meters long. If her speed is 15.0 m/s,
what is the centripetal force on her in "G's,"
where one G equals her weight on the Earth?
11. A ball with mass 0.48 kg moves at a constant
speed. A centripetal force of 23 N acts on the
ball, causing it to move in a circle with radius
1.7 m. What is the speed of the ball?
12. A car travels in a curve that is part of a circle. Its
velocity is 20 m/s, and the curve has a radius of
50 meters. If the centripetal force between the
tires and the road is 12,000 N, what is the mass
of the car?
U5 – WS 2 – Uniform Circular Motion
CP Physics
Unit 5 – Projectile Motion, UCM, Gravitation
1. For an object moving in uniform circular
motion, is the velocity constant? Is the speed
constant? Explain.
2. For an object moving in uniform circular
motion, what is the direction of its velocity?
What is the direction of its acceleration?
3. An unbalanced force must act on an object for it
to move in uniform circular motion. Describe at
least 3 examples of uniform circular motion and
identify the object that exerts the unbalanced
force on the object that is moving with uniform
circular motion.
4. What does the word centripetal mean and what
does “centripetal” describe about a force?
5. A string's tension force supplies the centripetal
force needed to keep a yo-yo whirling in a
circle.
a. What supplies the centripetal force keeping
a satellite in uniform circular motion around
the Earth?
b. What kinds of forces keep a roller coaster
held to a looping track?
6. Can a normal force, gravity or tension be in the
“centripetal” direction and cause an object to
move in circular motion. Provide examples
showing why or why not.
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7. A toy train travels in a circular path with radius
of 0.20 meters with a speed of 3.0 meters per
second. What is the centripetal acceleration of
the train?
8. A daredevil bike rider goes around a circular
track. The circular path has a radius of 15
meters, the mass of the bike a rider is 180 kg,
and the speed of the bike & rider is 25 meters
per second. What is the centripetal force on the
bike & rider?
9. A runner rounds a circular curve of radius
24.0 m at a constant speed of 5.25 m/s. What is
the magnitude of the runner's centripetal
acceleration?
10. An astronaut in training rides in a seat that is
moved in uniform circular motion by a radial
arm 5.10 meters long. If her speed is 15.0 m/s,
what is the centripetal force on her in "G's,"
where one G equals her weight on the Earth?
11. A ball with mass 0.48 kg moves at a constant
speed. A centripetal force of 23 N acts on the
ball, causing it to move in a circle with radius
1.7 m. What is the speed of the ball?
12. A car travels in a curve that is part of a circle. Its
velocity is 20 m/s, and the curve has a radius of
50 meters. If the centripetal force between the
tires and the road is 12,000 N, what is the mass
of the car?