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Chapter 05a

# Chapter 05a - Chapter 5A Work A force F does work when it...

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Chapter 5A 1 Work W = F cos θ ( 29 x A force F does work when it acts on an object, and the object moves through some displacement x . W = amount of work performed F = magnitude of applied force F (always + ) x = magnitude of displacement x (always + ) θ = angle between F and x .

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Chapter 5A 2 Work W = F cos θ ( 29 x Only the force component in the x direction contributes to the work. No work is done when the displacement, x , is zero. This definition assumes that the force is constant.
Chapter 5A 3 Work Work is a scalar quantity. It has no direction. Units: newton meter (N m) 1 N m = 1 joule (J) Work will be positive when Work will be negative when 0 ° ≤ θ < 90 ° . 90 ° < θ 180 ° .

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Chapter 5A 4 Positive and Negative Work When we lift an object at constant speed: We exert an upward force on the object. The object’s displacement is upward. The angle θ is 0 ° . Why? We have done positive work on the object.
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