Physics Review Question

Unit: Mechanics
Year: 1995 Question#: 19
Question: A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. The energy gained be the block is equal to the

(1 ) Work done on the block
(2 ) power applied to the block
(3 ) impulse applied to the block
(4 ) momentum given to the block

What is this question really asking?




Explanation by: Gabrielle

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Answer 1
Work done on the block

CORRECT

When a force is applied to an object causing it to move in the direction of the force, work is done. When work is done on an object, the object gains energy equal to the amount of work done on it. return to top























Answer 2
power applied to the block

INCORRECT

Power is the rate at which work is done. Power is not the energy gained by an object. return to top



























Answer 3
impulse applied to the block

INCORRECT

Impulse is the product of an average applied force and the time in which it acts. Impulse is not directly related to energy. return to top


























Answer 4
momentum given to the block

INCORRECT

Momentum is the product of mass and velocity of an object in motion. Momentum is not directly related to energy. return to top


























What's this question really asking?

This question is really asking what energy is and what happens when an object, under an applied force, gains energy. return to top

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