Quiz about Circular Motion and Universal Gravitation Review

Question 1

Two factors effecting the magnitude of the force of gravity between 2 objects are...

Accepted Answer

mass and distance

Answer

mass and matter

Answer

distance and weight

Answer

weight and mass

Question 2

According to Newton's law of gravitation, the Earth and the Moon are gravitationally attracted to each other. The more massive Earth attracts the Moon with...

Accepted Answer

the same force as the Moon attracts the Earth.

Answer

a stronger force than the Moon attracts the Earth.

Answer

a weaker force than the Moon attracts the Earth.

Answer

a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.

Question 3

Complete the following statement: The farther away two planets are the _______ the gravitational force between them.

Accepted Answer

less

Answer

more

Answer

same

Answer

dosen't matter

Question 4

Calculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a speed of 3.0 m/s if the ball weighs 0.12 kg and her arm is 0.65 meters long.

Accepted Answer

1.7 N

Answer

0.83 N

Answer

1.2 N

Answer

0.55 N

Question 5

A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 6

A car is rounding a curve as shown in the diagram. Which arrow correctly shows the direction of the centripetal force keeping the car in circular motion?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 7

A 30-kg child is on a merry-go-round which has a radius of 1.5 m. Her sister spins her at a speed of 9.0 m/s. How big is the centripetal force acting on the child?

Accepted Answer

1,620 N

Answer

180 N

Answer

405 N

Answer

54 N

Question 8

The time required for one complete revolution is:

Accepted Answer

period

Answer

torque

Answer

frequency

Answer

rotational kinetic energy

Question 9

What's the centripetal acceleration of a 0.20-kg yoyo spun in a circle with a radius of 0.70 meters at a speed of 3.0 m/s?

Accepted Answer

12.9 m/s2

Answer

8.23 m/s2

Answer

10.5 m/s2

Answer

2.6 m/s2

Question 10

You are moving a ball in a circle using 72 N of centripetal force. What would the force be if you doubled the radius of the circle?

Accepted Answer

36 N

Answer

18 N

Answer

72 N

Answer

144 N

Question 11

A 0.35-kg toy car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (F_c) acting on the car at a particular moment?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 12

A stopper at the end of a string is spun in a circle. If the radius of the string is 0.30 m, and the stopper makes one complete circle in 0.20 s, what is the speed of the stopper?

Accepted Answer

9.4 m/s

Answer

1.5 m/s

Answer

11.7 m/s

Answer

3.5 m/s

Question 13

A test car moves at a constant speed around a circular track. If the car is 48.2 m from the track's center and has a centripetal acceleration of 8.05 m/s², what is the car's tangential speed?

Accepted Answer

19.7 m/s

Answer

1.34 m/s

Answer

0.408 m/s

Answer

388 m/s

Question 14

Suppose a 770-kg race car going around a corner of a race track experiences a net force of 5300 N pulling it towards the center of the curve. If the car was moving at 25 m/s, what was the radius of curvature of this corner?

Accepted Answer

91 m

Answer

3.6 m

Answer

172 m

Answer

0.011 m

Circular Motion and Universal Gravitation Review

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