Work and Power
6
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.
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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. - PowerPoint PPT Presentation
Transcript of Work and Power
Work and Power
Work is done when a force is exerted on an object and the object moves a distance x.Work = force ·distanceW = F · dunits: N·m = JouleWork 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
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 cos(x)
Work Example 5A p.169
