True or False, please answer only if you are sure: A) The work done by a constan

Question

True or False, please answer only if you are sure:

A) The work done by a constant force acting on an object is independent of the orientation of the force relative to the motion of the object
B) The work done to raise a box onto a platform depends on how fast it is raised. (Neglect friction, assume it starts on the ground at rest, and ends up resting on the platform)
C) The kinetic energy of a moving object is always positive.
D) The kinetic energy of an object is independent of the direction of the motion involved.
E) Work cannot be done in the absence of motion.
F) The work-energy principle is perfectly valid even when there are frictional forces acting

Explanation / Answer

False .........A) The work done by a constant force acting on an object is independent of the orientation of the force relative to the motion of the object
True.........B) The work done to raise a box onto a platform depends on how fast it is raised. (Neglect friction, assume it starts on the ground at rest, and ends up resting on the platform)
True.........C) The kinetic energy of a moving object is always positive.
True..........D) The kinetic energy of an object is independent of the direction of the motion involved.
True..........E) Work cannot be done in the absence of motion.
True..........F) The work-energy principle is perfectly valid even when there are frictional forces acting

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