Physics Chapter 10 b.  Force is a vector, so it has direction!  ONLY the force in the direction causing the movement is used in calculating work  If.

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Presentation transcript:

Physics Chapter 10 b

 Force is a vector, so it has direction!  ONLY the force in the direction causing the movement is used in calculating work  If the force applied is at an angle, the vectors must be resolved to determine the force in the direction of motion

 For every circumstance, this equation works…  BUT, you have to know which direction is the important one!  W = F d cos Θ  Θ is the angle between the applied force and the direction of movement

 A sailor pulls a boat along a dock by a rope held at an angle of 60.0 o with the horizontal. How much work is done if the sailor exerts a force of 2.50 x 10 2 N on the rope and pulls the boat 30.0 m?  What we know:  F = 2.50 x 10 2 Nd= 30.0 m Θ = 60.0 o  Equation:  W = Fd cos Θ  Substitute:  W = (250 N)(30.0m)(cos 60)  Solve:  W = 3750 J

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