Generators convert mechanical energy into electrical energy.  

The acceleration due to gravity on the Moon is the same as on Earth.

The Kelvin scale has negative values.

Work in physics is defined as force times distance.

Scientific notation is used to express very large or very small numbers.

Objects in free fall accelerate at different rates independent of their mass.

Potential energy is the energy of position.

Sublimation is the change from solid to liquid.

Weight is a measure of the amount of matter in an object.

Time flows in both forward and backward directions.