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Willard Science 11

Chapter 11 Key Terms

QuestionAnswer
Motion Change in position relative to a reference point.
Frame of reference A system for specifying the precise location of objects in space and time.
Displacement The change in position of an object.
Speed The distance traveled didvided by the time interval during which the motion occured.
Velocity The speed of an object in a particular direction.
Acceleration The rate at which velocity changes over time; an objects accelerates if it's 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 moving over each other.
Created by: bpulliam
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