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# Quinn science M1

### Matter in Motion

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
Created by: cquinnd15.org