Net Work

How did we find Fnet? What did we do with ALL the forces?

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Mr. Agresta and Patches O’Houlihan are dragging a bag of wrenches for dodge ball practice across a floor that has a friction force of 15N. If Patches pulls the bag with a force of 30N and I pull the bag with a force of 50N, what is the net work done on the bag 20m?

W_net=F_net*d

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Now the bag of wrenches is being pulled with a force of 10N by Patches O’Houlihan at a CONSTANT velocity. What must the force of friction be?

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W_net=F_netd

The bag of wrenches is being pulled with a force of 10N by Patches O’Houlihan at a CONSTANT velocity. Now that we know friction, what is the net work done?

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W_net=F_netd

The bag of wrenches is being pulled with a force of 10N by Patches O’Houlihan at a CONSTANT velocity. What is the work done by poor Patches?

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W=F*d

What can we say about the forces acting on an object if the net work is ZERO?

What does that mean about velocity?

Wnet=(Fnet)d

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