Answers25-26 TX-Physics A-CRCircular Motion

Circular Motion Answers

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1
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Lucia wants to change the motion map shown so that it shows uniform circular motion.

Question illustration
A
She should change the length of each vector that is tangent to the circle so that it is the same as the vector pointing toward the center at that point.
B
She should change the direction of the vectors that are toward the center of the circle so that each points tangent to the circle opposite the existing tangent vectors.
C
She should change the direction of the vectors that are toward the center of the circle so that each points away from the center of the circle.
D
She should change the lengths of the vectors that point toward the center so that each is the same length.
2
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An object is in circular motion. How will the object behave if the centripetal force is removed?

A
It would move in a line away from the circle’s center.
B
It would move in a line toward the circle’s center.
C
It would move in a curved, circular path.
D
It would move in a line tangent to the circular path.
3

Which motion maps show an object in uniform circular motion? Check all that apply.VWXYZ

Question illustration
A
V
B
W
C
X
D
Y
E
Z
4

What must be true of a force that causes an object to move in a circular motion?

A
It acts parallel to the velocity and is directed toward the center of the circle.
B
It acts parallel to the velocity and is directed away from the center of the circle.
C
It acts perpendicular to the velocity and is directed toward the center of the circle.
D
It acts perpendicular to the velocity and is directed away from the center of the circle.
5

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s.

A
1.9 N
B
23 N
C
59 N
D
93 N
6

Johanna makes the table below to organize her notes about centripetal forces.Which type of force should she place in the cell marked X?

Question illustration
A
tension
B
gravity
C
friction
D
normal
7

What is the direction of the centripetal force when applied to an object?

A
the direction opposite to the object’s velocity
B
the same direction as the object’s velocity
C
perpendicular to an object’s motion
D
parallel with an object’s motion
8

A child on a spinning playground ride is 0.36 m from the center of the ride. The centripetal force on the child is 19 N.

A
3.7 kg
B
13 kg
C
23 kg
D
79 kg
9

In a uniform circular motion map, what is always true? Check all that apply.The dots are different distances apart.Acceleration vectors point in the direction of motion.Velocity vectors are always perpendicular to the circle.Acceleration vectors point toward the center of the circle.Velocity vectors are the same length.

A
The dots are different distances apart.
B
Acceleration vectors point in the direction of motion.
C
Velocity vectors are always perpendicular to the circle.
D
Acceleration vectors point toward the center of the circle.
E
Velocity vectors are the same length.
10

An object is represented by the dot on the motion map.

Question illustration
A
a satellite in orbit around a moon
B
a child on a swing that just stopped
C
a ball twirled on a string that just broke
D
a car driving around a curve

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