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