Chapter04 - Chapter4:NewtonsLaws ofMotion...

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Chapter 4 : Newton’s Laws  of Motion
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1. Force and Interactions Force Loosely defined as “pushing” or “pulling.” An influence that may cause a body to accelerate Vector Quantity Unit : N = kg m/s 2
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Four Common Types of forces The normal force When an object rests or pushes on a surface, the surface pushes back. Frictional forces In addition to the normal force, surfaces can resist motion along the surface.
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Tension forces—When a force is exerted through a rope or cable, the force is transmitted through that rope or cable as a tension. Weight—Gravity’s pull on an object. This force can act from large distances.
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Use a vector arrow to indicate magnitude and direction of the force.
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Superposition of Force 1 2 3 n n R F F F F = + + + = r r r r r L
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Any force can be replaced by its components vector, acting at the same point r F = ρ Φ ξ + ρ ψ = Φ ι+Φ ϕ
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Problem 4.6) Two forces, and , act at a point. The
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Chapter04 - Chapter4:NewtonsLaws ofMotion...

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