Forces and Interactions

H	H			*Forces and Newton's Laws of Motion*

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		Newton's Three Laws of Motion
					I, II, III		click for Wikipedia "If I have seen further it is by standing on the shoulders of giants." A Short History of Nearly Everything by Bill Bryson
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	"I have not yet been able to discover the cause of these properties of gravity from phenomena and I frame no hypotheses... It is enough that gravity does really exist and acts according to the laws I have explained, and that it abundantly serves to account for all the motions of celestial bodies. That one body may act upon another at a distance through a vacuum without the mediation of anything else, by and through which their action and force may be conveyed from one another, is to me so great an absurdity that, I believe, no man who has in philosophic matters a competent faculty of thinking could ever fall into it." Newton

	*How do we measure mass?*
	and we can also use Newton's Second Law

	The Four Fundamental Forces Gravity Electromagnetism Weak Nuclear Force Strong Nuclear Force
		*Mechancical Universe*
			*Inertial Frames of Reference*
							A frame of reference in which Newton's first law is valid. Newton's first law can be used to define what we mean by an inertial frame of reference, it is sometimes called the law of inertia. P195
	*Freebody Diagrams*

			*Freebody Diagram*

						*Freebody Diagram*
						Forces cause a change in motion. A change in the state of an object's motion. There is always an increase or decrease in velocity if the Forces on an object are unbalanced. Tony's Forces