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