PHY101_Chap4Fall09

PHY101_Chap4Fall09 - Chapter 4 Forces and Newtons Laws of...

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Unformatted text preview: Chapter 4 Forces and Newtons Laws of Motion 4.1 The concepts of force and mass Definitions Force: what hurts Force is what makes things interact with each other Contact force (easier to see) Noncontact force (more general than we feel) Gravity, electric/magnetic force, cell phone, remote Mass (kg): not the same as weight Weight: what you dont want to see when you step on a scale. Your weight will be different if you are on the moon. Mass is the intrinsic property of something. Doesnt change from one planet to another. Which of the following is an example of the type of force that acts at a distance? (non-contact) 1. gravitational 2. magnetic 3. electrical 4. all of the above Quiz Qn. 2 4.2 Newtons First Law of Motion An object continues to be at rest or moving with the same velocity (both magnitude and direction) without experiencing a force . No force, no change (inertia, measured by its mass) Engines, breaks: forces to cause change in velocity 4.3 Newtons Second Law Looks simple, but hard to calculate vectors Break it down to components F x = ma x F y = ma y Solve the two components independently Once a x and a y are known, we can use kinematics in two dimensions to solve the problems completely. If we know an object is moving at constant velocity, we may assume: 1. the net force acting on the object is zero....
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This note was uploaded on 01/02/2010 for the course PHY 101 taught by Professor Pralle during the Fall '08 term at SUNY Buffalo.

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PHY101_Chap4Fall09 - Chapter 4 Forces and Newtons Laws of...

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