# physics

 fundamental unit basic units from which all other units are made derived unit units that are a combination of two or more of the fundamental units converesions 1 hr = 3,600 s 1km = 1,000 m to change an object's motion you need __ __. the change an object's motion you need unbalanced forces. constant or no motion means __ __. constant or no movement means balanced forces. three ways to describe motion wordsmathgraphs reference point "zero" location in a frame of reference frame of reference a number line used to describe motion position separation between the object and reference point scalar quantity quantity that only has size/magnitude# and unitdistance is scalar vector quantity quantity that has size, magnitude and direction#, unit and directionacceleration, position, displacement, velocity instantaneous position position at a certain time distance (d) measures the separation between two objectsneeds no reference pointscalar quantity displacement (Δd) change in position of an object (start point to end point)vector quantity average velocity (v wit line) the displacement of an object divided by the time interval over which it moved. If the average velocity is the same throughout the time interval then we have __ __. If the average velocity is the same throughout the time interval then we have constant velocity. Speed vs. Velocity speed: distance divided by time; scalar quantity velocity: displacement divided by time; vecotr quantity acceleration the rate of change of velocity; change of velocity divided by time. velocity-time graphs the slope of a velocity-time graph represents acceleration.the area under a velocity-time graph represents displacement (vector quantity). distance-time graphs the slope of a position-time graph represents velocity (speed). linear motion motion that occurs in  straight line equation for constant acceleration equation for when acceleration is constant and we do not have final velocity equation used when acceleration is constant and you do not have time summary of three equations no displacement :   no final velocity :  no time : AuthorJustDoughnut ID237245 Card Setphysics Descriptionphysics. Updated2013-09-26T19:56:35Z Show Answers