## Chapter 2, Part 1

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mrparker71 Plus on August 18, 2009

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# Chapter 2, Part 1

 RelativeRegarded in relation to something else.
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#### Definitions

Relative Regarded in relation to something else.
Frame of reference Your point of view; your choice of what to compare an object's motion to.
Speed A scalar quantity that represents the distance an object travels in a given amount of time; change in distance divided by change in time.
Instantaneous speed The speed with which an object is moving at a specific point in time.
Average speed A measure of how long it took to travel a certain distance; total distance divided by total elapsed time.
Velocity A vector quantity which refers to "the rate at which an object changes its position;" speed in a given direction.
Constant velocity Constant speed & constant direction.
Acceleration A vector quantity which is defined as change of velocity; the rate at which the velocity of an object changes; change in velocity divided by change in time.
Rate A ratio between two measurements, often with different units; in this course, it is usually a quantity divided by time.
Mechanics The study of the motion of objects.
Kinematics The science of describing the motion of objects using words, diagrams, numbers, graphs, and equations.
Scalars Quantities that are fully described by a magnitude (or numerical value) alone.
Vectors Quantities which are fully described by both a magnitude and a direction.
Distance A scalar quantity which refers to "how much ground an object has covered" during its motion.
Displacement A vector quantity which refers to "how far out of place an object is"; it is the object's overall change in position.
Constant acceleration When the velocity of an object is changing by a constant amount each second.

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