Name: 
 

rotational motion



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

When an object is moving with uniform circular motion, the object’s tangential speed
a.
is circular.
b.
is perpendicular to the plane of motion.
c.
is constant.
d.
is directed toward the center of motion.
 

 2. 

When an object is moving with uniform circular motion, the centripetal acceleration of the object
a.
is circular.
b.
is perpendicular to the plane of motion.
c.
is zero.
d.
is directed toward the center of motion.
 

 3. 

What term describes a change in the speed of an object in circular motion?
a.
tangential speed
c.
centripetal acceleration
b.
tangential acceleration
d.
centripetal force
 

 4. 

What is the term for the net force directed toward the center of an object’s circular path?
a.
circular force
c.
centripetal force
b.
centrifugal force
d.
orbital force
 

 5. 

Which of the following can be a centripetal force?
a.
friction
c.
tension
b.
gravity
d.
all of the above
 

 6. 

The centripetal force on an object in circular motion is
a.
perpendicular to the plane of the object’s motion.
b.
in the plane of the object’s motion and perpendicular to the tangential speed.
c.
in the plane of the object’s motion and in the same direction as the tangential speed.
d.
in the plane of the object’s motion and in the direction opposite the tangential speed.
 

 7. 

The centripetal force on an object in circular motion is
a.
in the same direction as the tangential speed.
b.
in the direction opposite the tangential speed.
c.
in the same direction as the centripetal acceleration.
d.
in the direction opposite the centripetal acceleration.
 
 
A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg.
 

 8. 

What is the magnitude of the bicycle’s centripetal acceleration?
a.
1.0 m/s2
c.
4.0 m/s2
b.
2.0 m/s2
d.
8.0 m/s2
 

 9. 

What is the magnitude of the centripetal force on the bicycle?
a.
4.0 N
c.
86 N
b.
43 N
d.
3.7 kN
 

 10. 

What kind of force provides the centripetal force on the bicycle?
a.
gravitational force
c.
air resistance
b.
friction
d.
normal force
 

 11. 

When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car?
a.
centripetal acceleration
c.
centrifugal force
b.
centripetal force
d.
inertia
 

 12. 

A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
a.
centripetal acceleration
c.
centrifugal force
b.
centripetal force
d.
inertia
 

 13. 

Tides are caused by
a.
differences in the gravitational force of the sun at different points on Earth.
b.
differences in the gravitational force of the moon at different points on Earth.
c.
differences in Earth’s gravitational field strength at different points on Earth’s surface.
d.
fluctuations in the gravitational attraction between Earth and the moon.
 

 14. 

Why does an astronaut weigh less on the moon than on Earth?
a.
The astronaut has less mass on the moon.
b.
The astronaut is farther from Earth’s center when he or she is on the moon.
c.
The gravitational field strength is less on the moon’s surface than on Earth’s surface.
d.
The astronaut is continually in free fall because the moon orbits Earth.
 

 15. 

If you lift an apple from the ground to some point above the ground, the gravitational potential energy in the system increases. This potential energy is stored in
a.
the apple.
b.
Earth.
c.
both the apple and Earth.
d.
the gravitational field between Earth and the apple.
 

 16. 

An object’s tendency to resist acceleration is measured by the object’s
a.
gravitational mass.
c.
gravitational field strength.
b.
inertial mass.
d.
weight.
 

 17. 

The degree to which an object attracts other objects is measured by the object’s
a.
gravitational mass.
c.
gravitational field strength.
b.
inertial mass.
d.
weight.
 

 18. 

Which of the following confirms that gravitational mass and inertial mass are equivalent?
a.
Free-fall acceleration is the same throughout the universe.
b.
Free-fall acceleration is the same at all points where the gravitational field strength is the same.
c.
Newton’s second law is valid throughout the universe.
d.
An object’s weight can change with location, but the object’s mass remains constant.
 

 19. 

In this text, which of the following symbols represents gravitational field strength?
a.
Fmc019-1.jpg
c.
g
b.
G
d.
Fmc019-2.jpg
 

 20. 

In this text, which of the following symbols represents the constant of universal gravitation?
a.
Fmc020-1.jpg
c.