Mechanical Energy

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Mechanical Energy

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2. The work done by a constant force F applied to an object to increase the object's speed from v to 2v is W. The work done by the same force to increase the speed of the object from0 to v will be ...

2 points

1/4 W

1/2 W

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3. When the velocity of a moving object is doubled, the ...

2 points

net work done by the object is doubled.

kinetic energy of the object is doubled.

potential energy of the object is doubled.

linear momentum of the object is doubled.

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4. Which ONE of the following physical quantities is equal to the product of force and constant velocity?

2 points

Work

Power

Energy

Acceleration

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5. When a net force acts on an object, the kinetic energy of the object ...

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is zero.

increases.

decreases.

remains constant.

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6. A block of mass m is released from rest from the top of a frictionless inclinedplane QR, as shown below.

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7. If the net work done on a moving object is POSITIVE, then we can conclude that the kinetic energy of the object ...

2 points

is zero.

has increased.

has decreased.

has not changed.

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8. A person lifts a crate vertically upwards at constant velocity through a distance h. The person does work x on the crate in time t.The person now lifts the same crate vertically upwards at constant velocitythrough the same distance, but in time 2t.The work done by the person on the crate will now be ...

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