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lecture2A

# lecture2A - Physics 1A Lecture 2A"You must learn from the...

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Physics 1A Lecture 2A "You must learn from the mistakes of others. You can't possibly live long enough to make them all yourself." --Sam Levenson

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Motion Chapter 2 will focus on motion in one dimension. Any description of motion involves three concepts: 1) Displacement 2) Velocity 3) Acceleration
Displacement Nearly the first thing you must do in every Physics problem is define a coordinate system. Choosing the proper coordinate system can make a huge difference. For one dimensional motion it is rather easy. 1) Choose an origin. 2) Choose a positive direction. 3) Stick to your choices throughout the problem!

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Displacement x is defined as the position compared to the origin. x can be a positive or negative value. Displacement, x, is a difference between positions. x = x 2 –x 1 x can be a positive or negative value.
Displacement Distance, d, is the total length travelled. d can only be a positive value. For many problems, we will be dealing with an object in motion. Thus, the position, x, will change with time, t.

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