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Chapter III Dynamics

Chapter III Dynamics. The Net Force on a Body and Newton’s First Law Mass, Acceleration and Newton’s Second lLaw Weight Force of Gravit y Newton’s Third Law and Action-Reaction Pairs Force in Circular Motion Frictional Force. F 2. A. The N et F orce on a B ody and Newton’s First Law.

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Chapter III Dynamics

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  1. Chapter IIIDynamics • The Net Force on a Body and Newton’s First Law • Mass, Acceleration and Newton’s Second lLaw • WeightForce of Gravity • Newton’s Third Law and Action-Reaction Pairs • Force in Circular Motion • Frictional Force

  2. F2 A. The Net Force on a Body and Newton’s First Law • F1 + F2+ F3+ F4 = 0 • F = 0 Fx = 0  Fy = 0 F3 F1 F4 • EQUILIBRIUM • At rest • Moving with constant velocity If the net force exerted on an object is zero, thenthe acceleration of the object is zero and its velocity remains constant. • Inertia • An Inertial frame of reference • The tendency of an object to resist any attempt to change its velocity is called the inertia of the object. • An inertial frame of reference is one that is not accelerating

  3. B. Mass, Acceleration and Newton’s Second Law F6 F5 + F6+ F7+ F8≠ 0 F7 F5 F8 • Mass is that property of an object that specifies how much inertia the objecthas. • The acceleration of an object is directly proportional to the net force acting onit and inversely proportional to its mass. C. Weight/ Force of Gravity W = mg m g W

  4. D. Newton’s Third Law and Action-ReactionPairs F1 • F1 & F2 ; F3 & F4 ; W & W ‘ is Action-Reaction Pairs • Equal in Magnitude • Apposite in direction • Two objects interact(act on different bodies) F2 F3 If you press against a corner of this textbook with your fingertip, the book pushesback and makes a small dent in your skin. If you push harder, the book does thesame and the dent in your skin gets a little larger F4 W W ’

  5. E. Force in Circular Motion R v as Fs m m = mass v = velocity R = circular radius as = centripetal acceleration Fs = centripetal Force

  6. F. Frictional Force N F1 F f2 F2 f f1 F = f = fs = µs N The Beam nearly move fk = µk N The Beam have moved µs = Coefficient of Static friction µk = Coefficient of Kinetic friction N = Normal force (N) fs = Force of Static friction (N) fk = Force of Kinetic friction (N) Static/kinetic friction coefficient Just depend to rough of surface both of bodies

  7. The values of K and Sdepend on the nature of the surfaces

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