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Force and Motion
study materials for test
Question | Answer |
---|---|
speed | distance an object travels divided by the time it took to travel that distance |
velocity | speed in a certain direction |
acceleration | a change in velocity; can include speeding up, slowing down or changing direction |
unbalanced force | unequal forces that are needed to change the motion of an object |
balanced force | equal forces that do not allow motion to occur |
force | a push or a pull; expressed in Newtons |
friction | a force that goes against motion to cause an object to slow down or stop |
inertia | the tendency of objects to resist a change in their motion; an object at rest wants to stay at rest, an object in motion wants to stay in motion |
simple machine | device that reduces the force or effort needed to do a task or changes the direction of force needed to perform the task |
inclined plane | reduces force needed when angle of incline is reduced |
pulley | simple machine that reduces effort force needed to move an object |