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Unformatted text preview: Chapter 5: Force and Motion I 51 52 53 54 55 56 57 58 59 What Is Physics? Newtonian Mechanics Newton's First Law Force Mass Newton's Second Law Some Particular Forces Newton's Third Law Applying Newton's Law Force and Mass A force is a push or a pull. Force F ML T2 N (kg m/s 2 ) F Net Force Fnet The mass of an object is a quantitative measure of inertia. It is an intrinsic characteristics of a body. Mass m [M] kilogram (kg) Newton's First Law of Motion If no force acts on a body, the body's velocity cannot change; that is the body cannot accelerate a 0 if Fnet 0 An inertial (reference) frame is one in which Newton's laws hold. All accelerating reference frames are noninertial. Newton's Second Law of Motion The net force on a body is equal to the product of the body's mass and its acceleration. Fnet ma Fnet, x Fnet, y Fnet, z ma x ma y ma z The acceleration component along a given axis is caused only by the sum of the force components along that same axis, and not by force components along any other axis. Newton's Third Law of Motion When two bodies interact by exerting forces on each other, the forces are equal in magnitude and opposite in direction. FAB FBA All forces occur in pairs: Action Reaction The actionreaction forces act on different objects. Normal Force and Friction Force The normal force is one component of the force that a surface exerts on an object with which it is in contact namely, the component that is perpendicular to the surface. When an object is in contact with a surface there is a force acting on that object. The component of this force that is parallel to the surface is called the frictional force. Weight and Tension Weight W mg g 9.80 m/s 2 Cables and ropes transmit forces through tension. A massless rope (around a massless, frictionless pulley) will transmit tension undiminished from one end to the other. ...
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 Fall '08
 Chen
 Force, Mass

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