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Force and Motion
unit terms and definitions
| Term | Definition |
|---|---|
| Motion | an object is in motion when its distance from another object is changing |
| Reference Point | a place or object for comparison to determine if something is in motion |
| Instantaneous Speed | the rate at which an object is moving at that point in time |
| Velocity | speed of an object in a given direction |
| Line Graph | used to show motion of objects |
| Slope | the steepness of the line |
| Acceleration | the rate at which velocity changes (refers to increasing, decreasing, or constant/changing speed) |
| Force | a push or a pull |
| Newton | the SI units used for force |
| Net Force | all of the forces acting on an object at one time |
| Unbalanced Forces | can cause an object to start, stop, or change direction |
| Balanced Forces | equal forces acting in opposite directions |
| Friction | the force that two forces exert on each other when they rub together |
| Static Friction | friction that acts on objects that are not moving |
| Sliding Friction | occurs when 2 solid surfaces slide over each other |
| Rolling Friction | when an object roll over a surface |
| Fluid Friction | when a solid object moves through a fluid |
| Gavity | a force that pulls objects towards each other |
| Free Fall | when an object falls the only force acting is gravity-unbalanced force causes acceleration |
| Terminal Velocity | the greatest velocity a falling object reaches |
| Newton's 1st Law | an object at rest will remain at rest, an object moving at constant velocity will continue moving at a constant velocity UNLESS it is acted upon by an unbalanced force |
| Inetria | the tendency of an object at rest to resist a change in motion |
| Newton's 2nd Law | acceleration depends on an objects mass and on the net force acting on an object |
| Newton's 3rd Law | if one object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction |
| Paired Forces | for every action there is an equal and opposite reaction |
| Momentum | the momentum of a moving object can be determined by multiplying its mass * its velocity |
| Law of Conservation of Momentum | the total momentum of any group of objects remains the same(is conserved), unless outside forces act on an object |
| Centripetal Force | a force that cause an object to move in a circular path, the faster an object is moving the farther it travels before it hits the ground |
Created by:
owlbewise13
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