Dynamics Unit Exam Review

The diagram represents a box shown sliding down an inclined plane. Toward which point will the force of friction on the box be directed?

• 1

• 2

• 3

• 4

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NGSS.HS-PS2-1

Which diagram best represents the gravitational forces, Fg, between a satellite, S, and Earth?

• 
• 
• 
• 

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NGSS.HS-PS2-4

The diagram shows two bowling balls, A and B, each having a mass of 7.00 kilograms, placed 2.00 meters apart. What is the magnitude of the gravitational force exerted by ball A on ball B?

• 8.17 × 10^-⁹ N

• 1.11 × 10^-10 N

• 8.17 × 10^-10 N

• 3.3 × 10^-10 N

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NGSS.HS-PS2-4

The centers of two 15.0-kilogram spheres are separated by 3.00 meters. The magnitude of the gravitational force between the two spheres is approximately

• 3.34 × 10^-10 N

• 5.00 × 10^-⁹ N

• 1.11 × 10^–10 N

• 1.67 × 10^–9 N

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NGSS.HS-PS2-4

Gravitational force F exists between point objects A and B separated by distance R. If the mass of A is doubled and distance R is tripled, what is the new gravitational force between A and B?

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NGSS.HS-PS2-4

The radius of Mars is approximately one-half the radius of Earth, and the mass of Mars is approximately one-tenth the mass of Earth. Compared to the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the surface of Mars is

• smaller

• larger

• the same

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NGSS.HS-PS2-4

If the mass of one of two objects is increased, the force of attraction between them will

• decrease

• increase

• remain the same

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NGSS.HS-PS2-4

If the Earth were twice as massive as it is now, then the gravitational force between it and the Sun would be

• twice as great

• four times as great

• half as great

• the same

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NGSS.HS-PS2-4

Two bodies attract each other with a gravitational force of 10.0 Newtons. What will be the force of attraction if the mass of each body is doubled?

• 5 N

• 20 N

• 40 N

• 10 N

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NGSS.HS-PS2-4

A 1.0 × 10³-kilogram car travels at a constant speed of 20. meters per second around a horizontal circular track. The diameter of the track is 1.0 × 10²meters. The magnitude of the car's centripetal acceleration is

• 0.20 m/s²

• 8.0 m/s²

• 4.0 m/s²

• 2.0 m/s²

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NGSS.HS-PS2-1