5 ATHENA ch 13 Scott Foresman 2008
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| term |
 |
|
| definition |
|
|
| velocity |
the speed and direction of an object's motion |
| force |
a push or pull that acts on an object |
| work |
energy used when a force moves an object |
| power |
the rate at which work is done |
| equilibrium |
the state in which the net force is zero |
| inertia |
the tendency of an object to resist a change in motion |
| acceleration |
the rate at which the velocity of an object changes over time |
| machine |
a device that changes the direction or the amount of effort needed to do work |
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