Question

Spring into action A locust can jump as far as 1 meter, an impressive distance for such a small animal. To make such a jump, its legs must extend much more rapidly than muscles can ordinarily contract. Thus, instead of using its muscles to make the jump directly, the locust uses them to more slowly stretch an internal “spring” near its knee joint. This stores elastic potential energy in the spring. When the muscles relax, the spring is suddenly released, and its energy is rapidly converted into kinetic energy of the insect. A student is sliding down a rope, using friction to keep her moving at a constant speed. How do you choose the system so that it is isolated?

          Spring into action A locust can jump	as far as  1 meter, an impressive distance for such a small  animal. To make such a jump, its legs must  extend much more rapidly than muscles can  ordinarily contract. Thus, instead of using its  muscles to make the jump directly, the locust  uses them to more slowly stretch an internal  “spring” near its knee joint. This stores elastic  potential energy in the spring. When the muscles  relax, the spring is suddenly released, and its  energy is rapidly converted into kinetic energy of  the insect.

A student is sliding down a rope, using friction to keep her moving at a constant
speed. How do you choose the system so that it is isolated?

Added by Kacia G.

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