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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.
2
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Which expression can be used to calculate centripetal acceleration?

A
StartFraction 2 pi r over T EndFraction
Option A
B
StartFraction 4 pi squared r over r squared EndFraction
Option B
C
StartFraction 4 pi squared r over T EndFraction
Option C
D
StartFraction left parenthesis 2 pi r right parenthesis squared over r squared EndFraction
Option D
3

A box is being pulled to the right. The free body diagram is shown.

Question illustration
A
25 N
B
125 N
C
375 N
D
500 N
4

The diagram shows two sets of vectors that result in a single vector.

Question illustration
A
find the square of the first horizontal vector and the square root of the first vertical vector
B
find the square root of the first horizontal vector and the square root of the second horizontal vector
C
find the sum of the two horizontal vectors and the sum of the two vertical vectors
D
find the difference between the two horizontal vectors and the difference between the two vertical vectors
5

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
6

A book is sitting on a desk. What best describes the normal force acting on the book?

A
the upward force the desk pushes on the book
B
the upward force the book pulls on the Earth
C
the downward force the book pushes on the desk
D
the downward force the Earth pulls on the book
7

0.00510.432584

A
0.0051
B
0.43
C
25
D
84
8

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
9

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
11

The angle a vector makes with the x-axis of a coordinate system must be what size in order to make one or more of its components negative?

A
less than 30 degrees
B
between 30 and 60 degrees
C
between 61 and 90 degrees
D
greater than 90 degrees
12

Scientists are making plans to put a probe in orbit around Earth. They want the probe to enter the orbit shown below.

Question illustration
A
W
B
X
C
Y
D
Z
13

In which situation would a space probe most likely experience centripetal acceleration?

A
as it revolves around a planet
B
as it flies straight past a moon
C
as it is pulled in a line toward the Sun
D
as it lifts off from Earth
14

How does an object’s motion change as a result of centripetal acceleration?

A
The speed decreases in the same direction.
B
The speed increases in the same direction.
C
The direction changes along with the speed.
D
The direction changes but not the speed.
15

The diagram shows three vectors.

Question illustration
A
Option
Option A
B
Option
Option B
C
Vectors P and Py are components of vector Px.
D
Vectors Px and Py are components of vector P.
17

differenceproductquotientsum

A
difference
B
product
C
quotient
D
sum
18

Which situation during a basketball game involves centripetal acceleration?

A
The official tosses the ball up for the opening tip-off.
B
A player passes the ball to another player.
C
The basketball bounces off the backboard.
D
A player spins a basketball on his finger.
19

Two objects have the same center point of the circle, but are located at different positions away from the center point. Each object is moving with uniform circular motion.Which would describe the tangential speed of the objects?

A
both objects would have the same tangential speed
B
the object with the smaller radius has a faster tangential speed
C
the object with the larger radius has a faster tangential speed
D
both objects would have oscillating tangential speeds
20

A police officer draws a sketch of the scene of an accident, as shown.

Question illustration
A
W
B
X
C
Y
D
Z
21

A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball?

A
the force of gravity
B
the force of tension
C
the normal force
D
the pushing force
22

0.0250.0372.18.0

A
0.025
B
0.037
C
2.1
D
8.0

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