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Motion & Forces @wk
CCS 4th Grade Science
Question | Answer |
---|---|
position | a certain place |
motion | a change of position |
frame of reference | the things around you that you can sense and use to describe motion |
relative motion | a motion that is described based on a frame of reference |
speed | a measure of an object’s change in position during a unit of time; for example, 10 meters per second |
force | a push or pull |
net force | the result of two or more forces acting together on an object |
balanced force | a force that does not change the motion of an object |
unbalanced force | a force that changes the motion of an object |
acceleration | a change in the speed or direction of an object’s motion |
newton | the metric unit of force |
gravity | a force that pulls all objects toward each other |
weight | a measure of the force of gravity upon an object |
friction | a force that keeps objects that are touching each other from sliding past each other easily |
magnetism | the force of repulsion (pushing) or attraction (pulling) between poles of magnets |
power | the amount of work done for each unit of time |