Q4 of 101 Page 131

The negative of the work done by the conservative internal forces on a system equals the change in

The negative sign provides the convention that work done against a force field increases potential energy, while work done by the force field decreases potential energy.

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Two springs A and B (kA = 2kB) are stretched by applying forces of equal magnitudes at the four ends. If the energy stored in A is E. that in B is

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Two equal masses are attached to the two ends of a spring of spring constant k. The masses are pulled out symmetrically to stretch the spring by a length x over its natural length. The work done by the spring on each mass is

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The work done by the external forces on a system equals the change in

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The work done by all the forces (external and internal) on a system equals the change in