difference between distance and displacement - one has direction the other does not, a vector must have direction and... - magnitude, average velocity is a change in ? per unit time - position, acceleration is defined as a change in ? divided by time - velocity, symbol for the coefficient of friction - meu, arrows in a free body diagram show - individual forces acting on an object, newtons - units of weight, Newton's 3rd Law - when two objects collide the apply equal and opposite forces to each other, Weight - name of force pulling a stone down as it falls, Normal force - name of force that a surface applies to an object resting on it, Which two values may be used together to calculate an impluse - a change in force and a change in time, direction an object resting on earth's mass points - toward the center of the earth, elastic collision - two separate objects collide and then bounce apart , during a collision problem an object moving left has a - negative velocity, an object at rest has - a velocity of zero, distance - total distance traveled, displacement - how far you are from the start, vector is made of - direction and magnitude, what is scalar - speed/number without direction, acceleration - slope on velocity time graph, name of two combined vectors - resultant vector, flat line on a position time graph=  - velocity= zero, mass is measured in - kilograms, f/force=  - newtons, slope downward - negative slope, force units - newtons x seconds, impulse = - Change in momentum- force x time (ft)= mvf-mvo , letter used to represent momentum - P, equation used to calculate momentum - P=mv,

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