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Circular Motion and GravitationPowerPoint Presentation

Circular Motion and Gravitation

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Centripetal acceleration is always directed

- away from the center of the circular path
- toward the center of the circular path
- tangent to the circular path
- None of the above – it varies

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[MC Any]

[MC All]

Centripetal force is always directed

- away from the center of the circular path
- toward the center of the circular path
- tangent to the circular path
- None of the above – it varies

[Default]

[MC Any]

[MC All]

The speed of an object in circular motion is directed

- away from the center of the circular path
- toward the center of the circular path
- tangent to the circular path
- None of the above – it varies

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[MC Any]

[MC All]

If the mass of an object moving in circular motion is tripled and the radius and speedremain constant, thecentripetal force

- triples
- is 1/3 as much
- is nine times as much
- is 1/9 as much
- remains the same

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[MC Any]

[MC All]

The period for an object that goes around a circle 10 times in 5 sec has a period of

- 0.5 sec
- 2 sec
- 15 sec
- 50 sec

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[MC Any]

[MC All]

If the speed of an object moving in circular motion is tripled and the mass and radius remain constant, the centripetal force

- triples
- is 1/3 as much
- is 9 times as much
- is 1/9 as much
- remains the same

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[MC Any]

[MC All]

The unit for centripetal force is tripled and the mass and radius remain constant, the centripetal force

- m/s
- m/s2
- N
- Nm

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[MC Any]

[MC All]

The unit for centripetal acceleration is tripled and the mass and radius remain constant, the centripetal force

- m/s
- m/s2
- N
- Nm

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[MC Any]

[MC All]

The source of centripetal force for a car going around a curve on a flat road

- tension
- friction
- gravity
- inertia

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[MC Any]

[MC All]

The source of centripetal force for the earth moving around the sun is

- tension
- friction
- gravity
- inertia

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[MC Any]

[MC All]

The source of centripetal force for a mass being twirled on the end of a string is

- tension
- friction
- gravity
- inertia

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[MC Any]

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Centripetal force is directly related to ____and inversely related to ___.

- Radius, mass
- Mass and speed, radius
- Radius, mass and speed squared
- Mass and speed squared, radius

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[MC Any]

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If both masses are doubled and distance between them remains the same, the force of gravity is

- doubled
- ½ as much
- quadrupled
- ¼ as much
- the same

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[MC Any]

[MC All]

If the distance between the two masses is tripled and their masses remain the same, the force of gravity is

- tripled
- 1/3 as much
- nine times as much
- 1/9 as much
- the same

[Default]

[MC Any]

[MC All]

If an astronaut weighs 550 N on earth and she is at a distance that is double the earth’s radius, what would she weigh at that distance?

- 138 N
- 275 N
- 550 N
- 1100 N
- 2200 N

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[MC Any]

[MC All]

Which way does the force of gravity act? distance that is double the earth’s radius, what would she weigh at that distance?

- Away from each object
- Toward each object
- Same direction for each objecct

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[MC Any]

[MC All]

If a gravitational force exists between two bodies of different masses, which one feels the stronger force?

- The less massive object
- The more massive object
- Each feels the same force
- The more dense object

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[MC Any]

[MC All]

Andrea weighs 450 N on earth. How much would she weigh on Planet Z if the acceleration due to gravity on Planet Z is 4.67 m/s2?

- 96.4 N
- 2100 N
- 156 N
- 214 N

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[MC Any]

[MC All]

The mass of the moon is 7.3 x 10 Planet Z if the acceleration due to gravity on Planet Z is 4.67 m/s22 kg and the mass of the earth is 5.98 x 1024 kg. If their centers are 3.6 x 108 m apart, what is the gravitational force between them?

- 2.25 x 1052 N
- 6.24 x 1011 N
- 2.25 x 1020 N
- [6.02 x 1024 N

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[MC Any]

[MC All]

Find the distance between a 0.82 kg bowling pin and a 0.795 kg boling pin if the force of attraction is 6.75 x 10-10 N.

- 0.254 m
- 0.0644 m
- 15.5 m
- 3.94 m

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[MC Any]

[MC All]

Find the centripetal force provided by friction on a 45 kg skater as she rounds a curve of radius 12 m at a speed of 8 m/s.

- 2.5 N
- 30 N
- 240 N
- 75 N

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[MC Any]

[MC All]

A 70.0 kg child sits on the outer edge of a carousel. If the centripetal force acting on her due to friction is 2710 N and her speed is 8.80 m/s, how far from the center is she located?

- 2.0 m
- 0.5 m
- 0.227 m
- 0.0286 m

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[MC Any]

[MC All]

The Millenium Falcon has to orbit Nabu before landing. If the distance of 4562 km from the center of Nabu and has a centripetal acceleration of 4.42 m/s2, what is its orbital speed?

- 560 m/s
- 1060 m/s
- 4490 m/s
- 20,164 N

[Default]

[MC Any]

[MC All]

A 1.2 kg mass is attached to a string 1.0 long and swings in a horizontal circle at a rate of 8.0 turns in 6.0 s. What is the speed of the mass?

- 4.71 m/s
- 1.33 m/s
- 4.19 m/s
- 8.38 m/s

[Default]

[MC Any]

[MC All]

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