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Circular Motion Answers

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A remote-controlled plane has a mass of 0.386 kg and flies in a circle with a radius of 75 m. The centripetal force on the plane is 4.0 N.

A
11 m/s
B
28 m/s
C
45 m/s
D
784 m/s
2
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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
3

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.
4

Without inertia, how would an object that is experiencing a centripetal force behave?

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.
5

In a uniform circular motion map, what is always true? Check all that apply.

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.
6

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
7

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.
8

A wrecking ball has a mass of 650 kg. It swings from a cable that is 21 m long. The centripetal force on the ball is 56 N.

A
1.3 m/s
B
1.8 m/s
C
46 m/s
D
870 m/s
9

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
10

Suchita makes a table to identify the variables used in the equations for centripetal force.

Question illustration
A
X: tangential speedY: radius
B
X: radiusY: tangential speed
C
X: centripetal forceY: mass
D
X: massY: centripetal force

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