For each of the following statements, determine whether it is true or false. Wor

Question

For each of the following statements, determine whether it is true or false. Work cannot be done in the absence of motion. Spring A is stiffer than B (k_A > k_B). A person must do more work on spring A if both springs are stretched by the same amount. The spring force is a non-conservative force. The kinetic energy of an object depends on the direction of the motion involved. The kinetic energy can be negative. The kinetic energy of an object depends on the reference frame of the observer. The work a person must do to raise a box onto a platform depends on how fast it is raised. If the Moon revolves around Earth in a perfectly circular orbit, then Earth does do work on the Moon.

Explanation / Answer

a) True

b) True: w = 1/2 kx^2 ( as work done is directly proportinal to stiff constant, work has to be dome to compress or stretch a spring with higher spring constant)

c)False

d)false

e)false

f)true

g)false

h)false

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