Introduction to Machines — Unit test Answers
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As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?
A
It is increased.B
It is conserved.C
It is decreased.D
It is created.23
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Which simple machine is best used to split apart an object?
A
a screwB
a leverC
a wedgeD
a pulley24
Which two types of potential energies would be types of mechanical energies?
A
electrical and kineticB
nuclear and chemicalC
radiant and thermalD
elastic and gravitational25
Which set of terms best defines what affects kinetic energy and potential energy, respectively?
A
position, gravityB
gravity, velocityC
velocity, heightD
height, position26
Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate electricity.Which best completes the chart?
A
nuclear energy transformed to electrical energyB
chemical energy transformed to electrical energyC
radiant energy transformed to mechanical energyD
kinetic energy transformed to mechanical energyDid you find these answers helpful?
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