Question

fill in the blank ( Energy and momentum unit)

1. the work done to stretch a spring is not equal to the to force multiplied by displacement because force is ____ as the spring stretches

2. A child goes down a slide at the playground, gaining speed as she goes. Her momentum ____ because there is the presence of a(n) ____

Answer 1

no constant
the force increases as the spring stretches
F = k x
work = k x^2/2

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momentum increases
an external force, mg