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### 22 Cards in this Set

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• Back
 an object’s change in position relative to a reference point Motion the stationary object in relation to the object in motion Reference point the direction of an object in motion (N, S, E, W, UP, or DOWN) Reference direction the change in an object’s position Displacement ________ can be a straight line, but ____________ must be a straight line Distance, displacement ________ does not include direction, ____________ must include direction Distance, displacement the distance traveled divide by the time interval during which the motion occurred, or how fast an object travels Speed when an object covers equal distance in equal amount of time Constant Speed a combination of 2 velocities Resultant velocity calculated as distance divided by time Average speed simply the distance traveled by an object divided by the time it takes the object to travel that distance Average speed the speed at a given point in time, and it is measured in an infinitely small time interval Instantaneous Speed the rate at which velocity changes over time Acceleration an object accelerates if it’s _____, ________, or ____ changes speed, direction, or both The _____ of the line gives the value of acceleration slope an action exerted on a body in order to change the body’s state of rest or motion Force Force has _________ and _________ magnitude and direction the combination of all the forces acting on an object Net force ________ ______ do not cause an object at rest to start moving Balanced forces a force that opposes motion between two surfaces that are in contact Friction the force that opposes the movement of 2 surfaces that are in contact and are sliding or rolling over each other Kinetic friction the force that resists the initiation of sliding motion between 2 surfaces that are in contact at rest Static friction