For each of the following statements, determine whether it is trueor false. True

Question

For each of the following statements, determine whether it is trueor false.
TrueFalse The work done to raise a box onto a platform depends onhow fast it is raised.
TrueFalse The kinetic energy of an object depends on the directionof the motion involved.
TrueFalse The friction force is a non-conservative force.
TrueFalse The kinetic energy can be negative.
TrueFalse The kinetic energy depends on the reference frame of theobserver.
TrueFalse If the moon revolves around the earth in a perfectlycircular orbit, then the earth does do work on the moon.
TrueFalse Spring B is stiffer than A (kA <kB). Less work must be expended on spring A if bothsprings are stretched by the same amount.
TrueFalse Work can be done in the absence of motion.

Explanation / Answer

The work done to raise a box onto a platform depends on how fast itis raised. False bcs it only depend on themass and the height we raise The kinetic energy of an object depends on the direction of themotion involved. False because kineticenergy is a scalar quantity and only depend on the mass andthe magnitude of velocity, i.e. speed The friction force is a non-conservative force. True bcs energy will be transfer into heat The kinetic energy can be negative. Falsebecause K = mv^2 /2 and always positive The kinetic energy depends on the reference frame of theobserver. True bcs in differentframe, object have different speed, hence different kineticenergy If the moon revolves around the earth in a perfectly circularorbit, then the earth does do work on the moon. False. If the orbit is perfectly circular, the force exertedby earth on the moon is perpendicular to the motion, then result inno work Spring B is stiffer than A (kA

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