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# Force/Motion 5

force a push or pull on an object
motion change in position measured by distance and time
speed the distance an object travels in a certain amount of time (distance over time)
velocity how fast (speed) and how far (direction)
acceleration change in velocity; tells us the rate speed or direction changes
momentum measurement of the amount of force it would take to stop an object's motion (usually forward; mass (kg) x velocity (m/s); unit is kg*m/s
direction "the way" an object is headed
mass how much matter is in an object
gravity a force that pulls objects towards earth's center
inertia the tendency of motionless objects to remain motionless and moving objects to remain in motion
Newton's 1st Law law of inertia; an object at rest will remain at rest unless acted upon; an object in motion will remain in motion unless acted upon
Newton's 2nd Law force = mass x acceleration
Newton's 3rd Law for every action there is an equal and opposite reaction
friction force from two objects rubbing against each other; resistance to move
weight gravity's pull on an object
balanced force do not cause a change in motion; equal in size and opposite in direction
unbalanced force always cause a change in motion; forces are not equal and opposite
net force overall force on an object
Created by: crstone