lecture 6

lecture 6 - 1 Lecture 6 • Introduction to forces •...

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Unformatted text preview: 1 Lecture 6 • Introduction to forces • Newton’s three laws • Equilibrium 2 Isaac Newton was the first to discover that the laws that govern motions on the Earth also applied to celestial bodies. Over the next few chapters we will study how bodies interact with one another. 3 Simply, a force is a “push” or “pull” on an object. 4 Contact forces : these forces arise because of an interaction between the atoms in the surfaces in contact. A long-range or field force acts even though there is no contact is between bodies. “action at a distance” 5 Newton’s 1 st Law (The Law of Inertia): If no net force acts on an object, then its speed and direction of motion do not change. (Velocity remains constant.) Inertia is a measure of an object’s resistance to changes in its motion. 6 If the object is at rest it remains at rest (speed = 0). If the object is in motion it continues to move with constant velocity....
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lecture 6 - 1 Lecture 6 • Introduction to forces •...

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