Work and 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

• elastic potential energy

• kinetic energy

• gravitational potential energy

• nuclear energy

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

• electrical energy into electromagnetic energy

• thermal energy into nuclear energy

• nuclear energy into electrical energy

• mechanical energy into thermal energy

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

• Chemical potential energy

• kinetic energy

• mechanical energy

• electromagnetic energy

Unlike kinetic energy, potential energy is

• energy of motion

• conserved

• stored

• not measurable

Which of these is an example of a third-class lever

• scissors

• pliers

• fishing pole

• nutcracker

One example of a compound machine is a

• bicycle

• door

• pliers

• shovel

Which of these could be considered an inclined plan wrapped around a cylinder

• screw

• lever

• wheel and axle

• pulley

The fixed point that a lever pivots around is called the

• axle

• pulley

• gear

• fulcrum