PHY101_Chap4Fall09

PHY101_Chap4Fall09 - Chapter 4 Forces and Newton’s Laws...

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Unformatted text preview: Chapter 4 Forces and Newton’s 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 don’t 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. Doesn’t 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 Newton’s 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 Newton’s Second Law • Looks simple, but hard to calculate vectors • Break it down to components • Σ F x = ma x • Σ 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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PHY101_Chap4Fall09 - Chapter 4 Forces and Newton’s Laws...

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