Physics Forces Quiz 8

In an emergency stop, a 1500-kg vehicle loses 300,000 joules of energy as it comes to rest. What was the speed of the vehicle the moment the brakes were applied?

• 10 m/s

• 14 m/s

• 20 m/s

• 25 m/s

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If the kinetic energy of an object is 16 J when its speed is 4 m/s, what is the object’s mass?

• 0.5 kg

• 2.0 kg

• 8.0 kg

• 19.6 kg

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If a 5-kg mass is raised two meters vertically from the surface of Earth, its gain in gravitational energy will be:

• 5 J.

• 10 J.

• 20 J.

• 100 J.

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NGSS.MS-PS3-2

A spring has a spring constant of 120 N/m. How much energy is stored in the spring as it is stretched a distance of 0.20 meter?

• 2.4 J

• 4.8 J

• 12 J

• 24 J

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NGSS.HS-PS3-1

A 0.50-kg ball is thrown vertically upward with an initial velocity of 35 m/s. Approximately, how high will the ball rise?

• 35 m

• 60 m

• 85 m

• 120 m

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A baseball bat strikes a baseball that is at rest, and as a result the baseball flies away from the bat. The kinetic energy gained by the baseball as it leaves the bat is due to the:

• loss of gravitational energy of the ball as it falls back to the ground.

• gain in gravitational energy as the ball rises to the peak of its trajectory.

• loss of mass after the ball is hit.

• work done by the bat on the ball.

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NGSS.HS-PS3-1

A catapult with a spring constant of 10,000 N/m is used to launch a target from the deck of a ship. The spring is compressed a distance of 0.5 m before the 1.56-kg target launched. What is the target’s velocity as it leaves the spring?

• 10 m/s

• 20 m/s

• 30 m/s

• 40 m/s

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A ball is thrown vertically upward. As the ball rises, the ball’s total energy:

• decreases

• increases

• remains the same

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Potential energy due to an object's compression or extension is called ___________ potential energy.

• elastic

• kinetic

• static

• gravitational

An object is lifted upward at a constant speed. The gain in gravitational energy of the object is due to the:

• work done on the object.

• total force applied to the object.

• change in kinetic energy of the object.

• weight of the object.

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