Energy, Work & Simple Machines

The ability to do work is called ____.

• velocity

• energy

• conversion

• friction

Energy is measured in units called ____.

• joules

• pounds

• meters

• horsepower

The energy associated with motion is called ____.

• kinetic energy

• elastic potential energy

• gravitational potential energy

• nuclear energy

When you rub your hands together on a cold day, you use friction to convert ____.

• mechanical energy into thermal energy

• thermal energy into nuclear energy

• nuclear energy into electrical energy

• electrical energy into electromagnetic energy

The type of energy stored by fossil fuels such as coal is ____.

• kinetic energy

• mechanical energy

• chemical potential energy

• electromagnetic energy

Which of the following has kinetic energy?

• a rock poised for a fall

• an archer's bow that is drawn back

• a rolling bowling ball

• a car waiting at a red light

Unlike kinetic energy, potential energy is ____.

• energy of motion

• stored

• conserved

• not measurable

Potential energy that depends on height is called ____.

• kinetic energy

• gravitational potential energy

• elastic potential energy

• mechanical energy

How would you calculate an object's mechanical energy?

• add its kinetic and potential energies

• multiply its kinetic and potential energies

• subtract its kinetic energy from its potential energy

• subtract its potential energy from its kinetic energy

For work to be done on an object, ____.

• some force need only be exerted on the object

• the object must move some distance as a result of a force

• the object must move, whether or not a force is exerted on it

• the object must not move