Acceleration occurs whenever velocity changes. Mass Mass is simply the quantity of matter in a body. Force and Weight Force is a push or pull. 9.8 N. Density Density is the ratio of mass to volume of a body. Energy Energy may be potential which is static energy due to position, or kinetic due to motion .
Kinetic energy varies as the square of the speed of a moving body.
Power Power is the rate at which work is done or energy consumed. Its unit is the Watt .