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Force and Motion
| Term | Definition |
|---|---|
| Acceleration | the rate at which velocity changes over time; an object accelerates if its speed, direction or both change |
| Average Speed | the total distance traveled divided by the total time taken |
| Balanced Forces | a set of forces on an object that cancel one another out so that there is no overall force on that object; the combined force is the same as zero force; balanced forces will not cause a change in the motion of an object |
| Displacement | the change in position in an object |
| Force | a push or pull exerted on an object in order the change the motion of the object; force has size and direction |
| Friction | a forces that opposes motion between surfaces that are in contact |
| Inertia | the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction |
| Instantaneous Speed | the rate of motion at a particular instant in time |
| Motion | an object's change in position relative to a reference point |
| Net Force | the combination of all the forces acting on an object |
| Newton's Laws of Motion | a series of laws developed by Isaac Newton that describe the relationship between force and motion |
| Newton | the SI unit for force (symbol, N) |
| Position | the location of an object |
| Reference Point | a location to which another location is compared |
| Speed | a measure of how fast something moves; rate of motion |
| Unbalanced Forces | a set of forces exerted on an object that change the motion of that object; the combined force has size and direction; unbalanced forces are needed to make an object start moving, speed up, slow down or change direction |
| Vector | a quantity that has both size and direction |
| Velocity | the speed of an object in a particular direction |
| Velocity | the speed of an object in a particular direction |