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Quinn science M1
Matter in Motion
Question | Answer |
---|---|
motion | an object's change in position over time when compared to a reference point |
speed | the rate at which an object moves, depends on the distance traveled and the time it takes to travel that distance, = d/t |
velocity | speed in a particular direction |
acceleration | the rate at which velocity changes, speed, direction or both change |
force | a push or pull, has size and direction |
newton | the SI unit of force |
net force | the forces that results from combining all the forces exerted on an object |
friction | a force that opposes motion between two surfaces that are touching |
gravity | a force of attraction between objects due to their masses and distance between them |
weight | a measure of the gravitational force exerted on an object, usually the Earth |
mass | the amount of matter that something is made of |
reference point | an object that appears to stay in place in relation to an object being observed for motion |
average speed | the overall rate at which an object moves, total distance divided by total time |
resultant velocity | the combination of two or more velocities |
deceleration | negative acceleration, velocity decreases |
centripetal acceleration | the acceleration that occurs in a circular motion, constantly changes direction, acceleration occurs continuously |
balanced forces | net force is zero, no motion or acceleration |
unbalanced forces | net force is NOT zero, there is motion or acceleration |
sliding friction | direct contact of two surfaces |
rolling friction | use of wheels to reduce the amount of friction |
fluid friction | friction between an object and a liquid or gas |
static friction | disappears as soon as an object starts to move |
lubricant | a substance applied to surfaces to reduce friction between them |
reduce friction | lubricants, smoother surfaces, and use of wheels |
increase friction | rough surface, more force |
law of universal gravitation | all objects attract each other, depends on mass and distance between two objects |
more gravitational pull | more mass and less distance |