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Lecture Note

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Lecture 3
Kinematics

Copyright © 2010 Pearson Education, Inc.

Units of Lecture 3
Position, Distance, and Displacement,
Average Speed and Velocity, Acceleration
Motion with Constant Acceleration
Freely Falling Objects
Motion in Two Dimensions
Relative Velocity

Copyright © 2010 Pearson Education, Inc.

Position, Distance, and
Displacement
Before describing motion, you must set up a coordinate system – define an origin and a positive direction.

Copyright © 2010 Pearson Education, Inc.

Position, Distance, and
Displacement
The distance is the total length of travel; (Example - if you drive from your house to the grocery store and back, you have covered a distance of 8.6 mi).

Displacement is the change in position. (Example - If you drive from your house to the grocery store and then to your friend’s house, your displacement is 2.1 mi and the distance you have traveled is 10.7 mi).
Copyright © 2010 Pearson Education, Inc.

Distance is the length of

Displacement is the

the actual path taken by an object. straight-line separation of two points in a specified direction.

Distance, s is a scalar

Displacement, D is a

quantity (no direction)
Contains magnitude only and consists of a number and a unit.
Example:
(20 m, 40 mi/h)

vector quantity
Contains magnitude AND direction, a number, unit & angle. Example:
(12 m, 300; 8 km/h)

Consider travel from point A to point B in diagram below:

Consider travel from point A to point B in diagram below:

s = 20 m

A
Copyright © 2010 Pearson Education, Inc.

B

D = 12 m, 20o

A

θ

B

Example 1:
Two tennis players shown in Figure walk to the net to congratulate one another.
Find the distance travelled and the displacement of player A and B.

Solution 1: player B. player A
Distance travelled: 5 m Distance travelled: 2 m
Displacement:

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