The information that is collected during an expriencement

The things in an experiment that a scientist must keep the same to ensure a valid result.

The one thing in an experiment that a scientist will change

A force that slows or stops motion when objects rub together

A push or pull that causes an object to move, stop, or change direction

The force that pulls objects towards the center of the Earth

Energy waves that bend (change direction and speed)as they pass from one type of object to another.

Energy waves bouncing off the surface of an object (Mirrors or echoes return back to the source)

A clear piece of curved glass or plastic that bends passing light to focus or spread the light rays

The flow of electricity around a circuit

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