A forces is required to change an object's speed or direction.

*An object's change in position can be measured as the change in the object's position (in, cm, made-up units) divided by the time (seconds) change.
*Repeating motions are used to measure time.
*A force causes a change in the speed or direction (velocity) of an object.
*The greater the force the greater the change in motion.

Magnets and electricity produce related forces.

*Magnets attract or repel other magnets.
*Magnets attract certain kinds of materials.
*Forces can attract or repel other objects.
*Electric charges flowing through a wire can produce a measurable force on magnets and other objects.

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