PHY 231 Quiz: Quiz7
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Phy 231 quiz march 1, 2016 name_______________ section ___________ Jeffrey is trying to knock squirrels out of a tree using a spring to launch objects at them. He puts a rock of mass m on the spring, pushes it down a distance d, and then lets go. The rock then rises to a height h. This device can be explained using the energy concept. The elastic potential energy will be traded in for kinetic energy, which in turn gets converted into the gravitational potential energy of the rock. So d has to be large enough that there is energy left over for the kinetic energy. Kd2 = mgh + mv2 where v is the velocity of the rock at height h: how is h related to the mass m? (does it even matter how heavy the rock is?) According to the equation above, when m is larger, h will be smaller (and so will v).
