Bellwork How much work is done by a tennis racket on a tennis ball if it exerts a horizontal force of 44 Newtons on a 0.25 kg ball from a height of 1.0.

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Presentation transcript:

Bellwork How much work is done by a tennis racket on a tennis ball if it exerts a horizontal force of 44 Newtons on a 0.25 kg ball from a height of 1.0 meter? The ball travels 30 meters before it hits the ground.

Work at Angles Must determine the distance on which the force is exerted You may need to use trig! 1.Identify the forces in the system. Draw it out! 2.What is the question asking for? What is doing the work? On what? 3.Single out the force vector in the direction of motion.

A sailor pulls a boat 30 m along a dock using a rope that makes a 25° angle with the horizontal. How much work is done if he exerts a force of 255 N on the rope?

A rope is used to pull a metal box 15.0 m across the floor. The rope is held at 46° with the floor. A force of 628 N is used. What is the work done on the rope?

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