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SG_Chap4 - Chapter 4 Forces and Newtons Laws of Motion 4.1...

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1 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.
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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 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.
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