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# Forces & Motion

### chapters 5 and 6.1

TermDefinition
reference point an object that appears to stay in one place and is used to help determine the relative motion of a second object
motion an object's change in position relative to a reference point
speed the distance traveled divided by the time interval during which the motion occurred; distance divided by time; meters per second is the SI unit; does not keep track of direction
velocity the speed of an object in a particular direction; distance divided by time in a particular direction
acceleration the rate at which velocity changes over time; occurs if speed, direction, or both of these factors change; (final velocity minus starting velocity) divided by the time required to change the velocity
force a push or pull exerted on an object in order to change the motion of the object; includes both size and direction
net force the combination of all the forces acting on an object; same direction forces are added together while opposite direction forces are subtracted; balanced forces result in no motion
newton the SI unit for force (N)
inertia the tendency of an object to resist a change in motion or position; measured in terms of mass
friction a force that opposes motion between two surfaces that are in contact
static friction friction between two or more solid objects that are not moving relative to each other
sliding friction the frictional force which opposes the actual relative sliding motion between two contact surfaces
rolling friction the resistive force that slows down the motion of a rolling ball or wheel
mass a measure of the amount of matter in an object; SI unit is the g or kg
weight a measure of the gravitational force exerted on an object; SI unit is N
air resistance the force that opposes the motion of objects through air; depends on size, shape, and speed of the object
gravity a force of attraction between objects that is due to their masses
terminal velocity the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
free fall the motion of a body when only the force of gravity is acting on the body; can only occur where there is no air
projectile motion the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth; its two components are horizontal motion and vertical motion
Created by: ritajrogers