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# Forces8th

### Forces8th vocab

Momentum the product of an object's mass and its velocity
formula for momentum m=pv
law of conservation of momentum the total momentum of any group of objects remains the same unless outside forces also act on the objects
Force a push of pull that gives energy to an object
Units of forces forces are measured in Newtons; N
net force the total of all the forces acting on a object
inertia the tendency of matter to resist a change in its motion
balanced forces the net force acting on an object is zero
unbalanced forces the net force acting on an object is not zero
magnitude the amount of a measurement
friction a force that one surface exerts on another when the two surfaces are in contact with each other
static friction friction between non-moving object
Kinetic Friction Friction between moving objects
Sliding Friction friction between objects that slide (rub) against each other
Rolling Friction Occurs when an object rolls over a surface
Fluid Friction Occurs when an object moves through a fluid or a gas
Newton's First Law of Motion Objects at rest will stay at rest & objects in motion will stay in motion at a constant velocity unless acted on by an unbalanced force
Newton' s Second Law of Motion The net force acting on an object is equal to the product of the object's mass & acceleration
Newton's Third Law of Motion For every action force there is a reaction force that is equal, but acts in the opposite direction
Law of Universal Gravitation All objects in the universe are attracted to each other; strength of attraction depends on the objects' masses and distance from each other
Freefall The motion of an object when GRAVITY is the only force acting on it
Terminal Velocity Greatest velocity of a fslling object; occurs when the force of GRAVITY is EQUAL to the force of FRICTION
Weight A measure of the force of GRAVITY on an object
Mass The amount of matter in something
Centripetal Force The force that is pulling an object in circular motion towardss the center of the circle
Geosynchronous Orbit Occurs when an object orbits another object at a rate equal to the 2nd object's raate of rotation
Created by: bobodd