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Motion
motion, speed, force
| Term | Definition |
|---|---|
| speed | a measure of the distance an object travels in a given amount of time; formula: speed = distance/time |
| average speed | this is helpful if an object is changing speed a lot; formula: average speed = total distance/total time |
| distance | the entire length of an object's path |
| displacement | the difference between the starting position and the ending position; this is not always the same as distance because your path isn't always straight |
| velocity | the speed AND direction of a moving object; ex: 4 m/s southeast; formula: velocity = displacement/time |
| inertia | an object's resistance to changing its motion |
| acceleration | an increase in an object's speed |
| Newton's 1st Law | An object in motion will remain in motion, and an object at rest will remain at rest unless acted upon by an unbalanced force. |
| balanced forces | equal in size, opposite in direction, no change in motion (think tug-of-war, pulling on opposite ends of a rope) |
| unbalanced forces | not equal in size, direction changes, causes a change in motion (think of tug-of-war, one side is stronger so the rope is moving towards that side) |
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smallscience7