Which of the following statements concerning work/energy is always true? A) Doub

Question

Which of the following statements concerning work/energy is always true?

A) Doubling the amount of time a force is applied will double the work done on an object by the force.

B) Since KE is always positive, the net work on a particle must be positive.

C) The work done by a conservative force is zero.

D) If a force is perpendicular to the direction of motion of an object, the force is not changing the kinetic energy of the object.

E) The work done by a frictional force depends only on the initial and final points of the path of a particle.

Explanation / Answer

A) Doubling the amount of time a force is applied will double the work done on an object by the force.

FALSE

B) Since KE is always positive, the net work on a particle must be positive.

FALSE

C) The work done by a conservative force is zero.

TRUE

D) If a force is perpendicular to the direction of motion of an object, the force is not changing the kinetic energy of the object.

TRUE

E) The work done by a frictional force depends only on the initial and final points of the path of a particle.

FALSE

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