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# science

### motion,forces,,and simpple machines

what is average speed? when you divide the distance traveled by the time it takes to travel the distance.
whats is instantaneous speed? the speed of an object at any instant of time.
what is velocity? the speed of an object and its direction of motion.
what is acceleration? the changge in velocity divided by the time needed for change to occur.
what three ways can speed be described? constant,instantaneous,average
when does velocity change? when the speed changes,the direction of motion changes.
what is force? a push or pull measured in nuetrons.
what is newton's laws of motion? a set of rules developed by Issac Newton to explain how forces affect the motion of an object.
what is inertia? tendency to resist a change in motion.
what is friction? force that resists slidinng motion between two touching surfaces;always acts opposite to the direction of motion.
what is newton's 1st law? an object will not change its mmotion unless an unbalanced force acts upon it
what is newton's 2nd law? if an object is acted upon by a force,the acceleration of the object will be in the direction of the force divided by the mass
what is newton's 3rd law? when one object exerts a force on a second object,the second object exerts anequal force iin the opposite direction on the first object.
Created by: 100002669299615