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Objective: To differentiate between speed and acceleration.Key Terms: speed average speed instantaneous speed acceleration

SPEED Speed is the ratio of the distance an object

moves to the amount of time the object moves.

Average speed is computed for the entire trip while instantaneous speed is measured at a particular instant.

Average Speed Average speed is calculated by dividing the

total distance travelled by the total time it took.

Instantaneous Speed The rate at which an object is moving at a

given instant in time. The reading on a car speedometer is an

example of instantaneous speed.

Graphing Motion The slope of a line on a distance versus time

graph is speed.

Velocity Description of both speed and direction of

motion

Velocity is combined by vector addition

Recap What is the difference between instantaneous

and average speed? How do we calculate speed?

Homework Pg 337 #1-9

DO NOW Take out your homework What is the difference between

average speed and instantaneous speed?

Objective: To be able to calculate speed and acceleration.

Acceleration Can be described as a change in speed, changes in

direction, or changes in both. Acceleration is a vector.

An example of acceleration due to a change in speed is freefall.

An example of acceleration due to a change in direction is riding a bicycle around a curve.

Constant acceleration is a steady change in velocity.

Calculating Acceleration Acceleration = change in velocity/time

Unit is m/s2

Graphing Acceleration The slope of a speed versus time graph is

acceleration.

A positive slope shows an increase in acceleration, a negative slope shows a decrease in acceleration, and a flat line shows constant speed.

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