Work and Power

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# Work and Power - PowerPoint PPT Presentation

Work and Power. Work is done when a force is exerted on an object and the object moves a distance x. Work = force ·distance W = F · d units: N·m = Joule Work is a scalar quantity. For work to be done, Force exerted must be in same linear plane as distance. Work.

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## PowerPoint Slideshow about 'Work and Power' - beverly-bishop

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Presentation Transcript
Work and Power

Work is done when a force is exerted on an object and the object moves a distance x.

Work = force ·distance

W = F · d

units: N·m = Joule

Work is a scalar quantity. For work to be done, Force exerted must be in same linear plane as distance.

Work

When you hold something, are you exerting a force on the object?

When you hold something, are you doing work?

If you set the object on a table, does the table exert a force on the object? Does the table do any work?

Yes.

No.

Yes.

No.

When you hold something, then, you are not doing work either.

Work

Work is only done by a force on an object if the force causes the object to move in the direction of the force.

Work

When a force is

applied at an angle,

use the component

of the force in the

direction of motion.

W =F cosq(Dx)