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10 terms

Physical Science Exam Review (Ch. 10)

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Motion
an object's change in position relative to a reference point
Speed
the distance traveled divided by the time interval during which the motion occurred
Velocity
the speed of an object in a particular direction
Acceleration
the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
Force
an action exerted on a body in order to change the body's state of rest or motion; force has magnitude and direction
Friction
a force that opposes motion between two surfaces that are in contact
Static Friction
the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest
Kinetic Friction
the force that opposes the movement of two surfaces that are in contact and are sliding over each other
Resultant Velocity
two velocities that are in the same direction added together
Balanced Forces
two forces that balance each other out