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force & motion
force and motion
| Term | Definition |
|---|---|
| motion | the state in which one objects distance from another is changing |
| reference point | a place or object used for comparison to determine if an object is in motion |
| instantaneous speed | shows your speed in an instant |
| acceleration | the rate at which velocity changes refers to increasing speed decreasing speed or changing direction |
| force | a push or pull |
| newton | the SI units used for force 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 direction |
| friction | the force that two surfaces exert on each other when they rub together |
| static friction | friction that acts on objects that are not moving |
| gravity | a force that pulls objects toward each other |
| sliding friction | occurs when two solid surfaces slide over each other |
| fluid friction | when a solid object moves through a fluid |
| rolling friction | when an object rolls over a object |
| weight= | mass x force of gravity acceleration |
| free fall | when an object falls the only force acting upon it is gravity |
| terminal velocity | the greatest velocity a falling object reaches for every is an object falls its velocity increases by 9.8 m/s |
| newtons #1 law | an object at rest will stay at rest. an moving object will continue to move unless it is acted upon a unbalanced force |
| inertia | the tendency of an object at rest to change in motion. inertia depends on more mass-more inertia . |
| newtons #2 law | acceleration depends on an objects mass and on the net force acting on the object |
| acceleration= | net force/mass |
| newtons #3 law | if one object exerts a force on another object exerting force of equal force in the opposite direction >< |
| paired forces | for every action there is an equal and opposite reaction |
| momentum | a moving object can be determined by multiplying its mass(x) its velocity |
| momentum= | mass x velocity |
| law conservation of momentum | the total momentum of any group of objects remains the same (is conserved) unless outside forces act upon objects |
| centripetal force |
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