ppu 960 physics note [sem 1 : chapter 3 - dynamics]

00

STPM

2012

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Chapter 3 – Dynamics By : Josh, LRT

2012 © LRT Documents Copyrighted. All rights reserved. Page 1 of 15

Chapter 3 – Dynamics 3.1 Newton’s Laws of Motion

Newton’s Laws:

1. Newton's First Law of Motion,

This explains a body which resists the changes to its state of rest or motion and it’s known

as inertia. The inertia of a body is measured by its mass.

A conclusion can be made here: .

2. Newton's Second Law of Motion,

This explains the present of some force which is the resultant of total forces acting per unit

surface. This come with a formula → .

3. Newton's Second Law of Motion,

Whatever the situation of any force exerted to an object there will be an opposite forces. A

conclusion can be made: .

What Really Happened with the Apple?

Probably the more correct version of the story is that Newton, upon observing an apple fall from a

tree, began to think along the following lines: The apple is accelerated, since its velocity changes

from 0 as it is hanging on the tree and moves toward the ground. Thus, by Newton's 2nd Law there

must be a force that acts on the apple to cause this acceleration. Let's call this force "gravity", and

the associated acceleration the "acceleration due to gravity". Then, imagine the apple tree is twice

as height. Again, we expect the apple to be accelerated toward the ground, so this suggests that this

force that we call gravity reaches to the top of the tallest apple tree.



3.2 Frictional Force



3.3 Conservation of Linear Momentum

Linear momentum,

is defined as the product between mass and velocity.

is a vector quantity.

states “In an isolated (closed) system, the total momentum of that system is constant.”



3.4 Elastic and Inelastic Collisions



3.5 Center of Mass