motion,forces,,and simpple machines
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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| what is average speed? | when you divide the distance traveled by the time it takes to travel the distance.
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| whats is instantaneous speed? | the speed of an object at any instant of time.
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| what is velocity? | the speed of an object and its direction of motion.
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| what is acceleration? | the changge in velocity divided by the time needed for change to occur.
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| what three ways can speed be described? | constant,instantaneous,average
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| when does velocity change? | when the speed changes,the direction of motion changes.
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| what is force? | a push or pull measured in nuetrons.
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| 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.
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| what is inertia? | tendency to resist a change in motion.
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| what is friction? | force that resists slidinng motion between two touching surfaces;always acts opposite to the direction of motion.
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| what is newton's 1st law? | an object will not change its mmotion unless an unbalanced force acts upon it
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| 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
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| 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.
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