Chapter 7 Work.

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Presentation transcript:

Chapter 7 Work

Work Work is the transfer of energy that results from applying a force over a distance Work is done by forces that cause movement The force applied and the distance covered MUST be in the same direction, or no work is done.

Work

Units of Work You do one joule of work if you push an object a distance of 1 meter with a force of 1 Newton 1 J = 1 N•m

Calculating Work Example: How much work is this girl doing by pushing the cart?

Calculating Work A crane lifts a 50 N crate 2 m. How much work does the crane do? A teacher carries a 250 N pile of textbooks across the room 3 m. How much work does the teacher do? How far does a 100 N force have to move to do 1,000 J of work?

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