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Science
9th -
12thgrade
Circular Motion and Universal Gravitation Review
18 questions
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- 1. Multiple ChoiceTwo factors effecting the magnitude of the force of gravity between 2 objects are...mass and distancemass and matterdistance and weightweight and mass
- 2. Multiple Choice
Two massive objects placed a distance d apart from each other attract each other with a gravitational force. If they are rearranged so that they are now d/3 apart, the force is now ---.
9× what it was
1/9× what it was
3× what it was
1/3× what it was
6× what it was
- 3. Multiple Choice
Two objects pull on each other with a gravitational force. What happens to that gravitational force if I double both of the masses but don't change their distance?
2× what it was
1/2× what it was
4× what it was
1/4× what it was
- 4. Multiple Choice
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...
a stronger force than the Moon attracts the Earth.
a weaker force than the Moon attracts the Earth.
the same force as the Moon attracts the Earth.
a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.
- 5. Multiple ChoiceComplete the following statement: The farther away two planets are the _______ the gravitational force between them.moresamedosen't matterless
- 6. Multiple Choice
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.
0.83 N
1.2 N
0.55 N
1.7 N
- 7. Multiple Choice
A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?
A
B
C
D
- 8. Multiple Choice
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?
A
B
C
D
- 9. Multiple Choice
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?
180 N
405 N
1,620 N
54 N
- 10. Multiple Choice
The time required for one complete revolution is:
torque
frequency
period
rotational kinetic energy
- 11. Multiple Choice
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?
8.23 m/s2
10.5 m/s2
12.9 m/s2
2.6 m/s2
- 12. Multiple Choice
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?
18 N
36 N
72 N
144 N
- 13. Multiple Choice
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 (Fc) acting on the car at a particular moment?
- 14. Multiple Choice
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?
9.4 m/s
1.5 m/s
11.7 m/s
3.5 m/s
- 15. Multiple Choice
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?
19.7 m/s
1.34 m/s
0.408 m/s
388 m/s
- 16. Multiple Choice
"A moon of Jupiter is found orbiting it at a velocity of just under 11,000 m/s." The problem with this statement is ---.
nothing
the unit for velocity for something moving in circular motion is m/s², not m/s
velocities cannot be calculated for things in space
velocity is a vector, and is always changing direction for circular motion, so what was reported was really just the speed
- 17. Multiple Choice
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?
3.6 m
172 m
91 m
0.011 m
- 18. Multiple Choice
Two masses, A and B, attract each other with a gravitational force when they are placed a distance d apart. If B is replaced with something with 2× the mass, and the distance is changed to 3× the distance, the force is --- what it was before.
4/3
2/9
2/3
4/9
- Answer choicesTagsAnswer choicesTags