the unit used to express energy
joule
the rate at which work is done or energy is transformed
power
the unit used to express power
watt
the transfer of energy to an object by using a force that causes the object to move in the direction of the force
work
a device that helps do work
machine
a number that tells how many times a machine multiplies force
mechanical advantage
a quantity that measures the ratio of work input in a machine
mechanical efficiency
the work done on a machine
work input
the work done by a machine
work output
a machine made of more than one simple machine
compound machine
a simple machine that is a straight, slanted surface
inclined plane
a simple machine that consists of a bar that pivots at a fixed point called a fulcrum
lever
a simple machine that consists of a wheel over a rope, chain, or wire
pulley
a simple machine that consists of an inclined plane wrapped around a cylinder
screw
a simple machine that is made up of two inclined planes and that moves
wedge
a simple machine consisting of two circular objects of different sizes
wheel and axle
the capacity to do work
energy
the energy of an object that is due to the object's motion
kinetic energy
he amount of work an object can do because of the object's kinetic and potential energies
mechanical energy
the energy that an object has because of the position, shape, or condition of the object
potential energy