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chapter 3 moving objects bloom 6 science
Question | Answer |
---|---|
force | a push or a pull |
gravity | the force of attraction that exists between any two objects |
mass | the amount of matter in an object |
weight | a measure of the pull of gravity on an objects mass |
newton | in the metric system the unit used to measure force or weight |
net force | the combination of all the forces acting on an object |
balanced forces | equal forces acting in opposite directions |
relative motion | the change in position of one object compared to the position of another |
frame of reference | the object an observer uses to detect motion |
speed | the distance an object moves in a certain period of time |
instantaneous speed | the speed at any given point |
speedometer | a device that shows instantaneous speed |
velocity | a measure of both speed and direction of a moving object |
acceleration | the change in velocity during a particular time period |
law | a statement that describes events or relationships that exist in nature |
inertia | the resistance of an object to change in its state of motion |
friction | the force between surfaces that resists the movement of one surface past the other surface |
air resistance | the friction from air molecules hitting an object as the object moves through the air |
tanner | weinfurtner |