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| Pregunta | Respuesta |
| force | Force is a push or pull; it gives energy to an object causing it to change its position, start/stop moving or change directions. Force has no direction. |
| motion | a change in a position in a certain amount of time |
| friction | a force that acts in a direction opposite to the motion of a moving object |
| speed | the rate at which an object move |
| stationary | still, not moving |
| frame of reference | the object that is used for comparison to calculate speed |
| sliding friction | dragging a book over a desk |
| rolling friction | wheels |
| fluid friction | liquids/gasses and air resistance |
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