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Work

Work transfers energy to a system through the forceful manipulation of its state. Do some work on yourself to master this fundamental mode of energy transfer.

Warmup

         

Ben wants to ascend to height \(h\). He has two choices:

He can either climb a ladder or he can walk up a slope.

In which case would Ben do more work against gravity?

When an airplane lands on a runway, its speed decreases very quickly and it soon comes to a halt. What is the sign of work done by all the forces acting on the plane when it lands?

Frank tied a string to his toy car and wants to pull it along with him as he walks along his room. He can pull the toy car with a force of \(\SI{5}{\newton}\)

At what angle should he pull the string so that he does maximum work on the toy car?

John observed the motion of the football and said:

Gravity is doing negative work on the football

Assuming John is correct, what can we conclude from John's statement?

Alice climbed the red ladder in 5 seconds, and the blue ladder (which is twice as long) in 10 seconds.

Did she spend more energy climbing the red ladder, or the blue ladder?

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