Conceptual - Work Energy

Question

For each of the following statements, determine whether it is trueor false.
The work done to raise a box onto a platform depends on how fast itis raised.
Work can be done in the absence of motion.
The kinetic energy depends on the reference frame of theobserver.
The gravitational force is a conservative force.
If the earth revolves around the sun in a perfectly circular orbit,then the sun does do work on the earth.
The kinetic energy of an object depends on the direction of themotion involved.
Spring B is stiffer than A (kA < kB). Morework must be expended on spring A if both springs are stretched bythe same amount.
The kinetic energy can be negative.
For each of the following statements, determine whether it is trueor false.
The work done to raise a box onto a platform depends on how fast itis raised.
Work can be done in the absence of motion.
The kinetic energy depends on the reference frame of theobserver.
The gravitational force is a conservative force.
If the earth revolves around the sun in a perfectly circular orbit,then the sun does do work on the earth.
The kinetic energy of an object depends on the direction of themotion involved.
Spring B is stiffer than A (kA < kB). Morework must be expended on spring A if both springs are stretched bythe same amount.
The kinetic energy can be negative.

Explanation / Answer

For each of the following statements, determine whether it is trueor false. The work done to raise a box onto a platform depends on how fast itis raised. false Work can be done in the absence of motion. false The kinetic energy depends on the reference frame of theobserver. true The gravitational force is a conservative force. true If the earth revolves around the sun in a perfectly circular orbit,then the sun does do work on the earth. false The kinetic energy of an object depends on the direction of themotion involved. false Spring B is stiffer than A (kA

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