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22 Cards in this Set

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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