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Force & Motion
Term | Definition |
---|---|
force | Energy that moves an object; a push or pull |
friction | Force that slows down moving things and produces heat |
inertia | an object keeps doing what it is doing; stays at rest or stays in motion |
mass | the amount of matter in an object |
1st Law of Motion | An object at rest stays at rest unless a force acts upon it and an object in motion stays in motion unless a force changes it |
2nd Law of Motion | The greater the mass an object has, the more force that is needed to move it, stop it, or change direction |
3rd Law of Motion | For every force or action there is an equal and opposite reaction |
gravity | invisible force that pulls things towards the ground |