Work-Energy Theorem Tutorial PDF

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These are mythology notes. It is about the work-energy theorem....

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WORK and the WORK-ENRGY THEOREM

energy

horizontal force on the block. direction of the displacement of the block and the direction of the force by the hand. Displacement of block

Force on block by hand

Explain how you chose the direction of the force on the block by the hand

Is the block speeding up, slowing down, or moving with constant speed? Explain….

2. Suppose that the block again moves to the left but now the work done by the hand is negative. In the boxes below draw arrows to represent the direction of the displacement of the block and the direction of the force of the hand. Displacement of block

Reproduced from “Tutorials in Introductory Physics” McDermott, Shaffer, & P.E.G, U. Washington Prentice Hall Inc. (2002)

Force on block by hand

Explain how you chose the direction of the force on the block by the hand

Is the block speeding up, slowing down, or moving with constant speed? Explain….

B. In a separate experiment two hand push horizontally on the block. Hand 1 does positive work and hand 2 does negative work (WH1 > 0, WH2 < 0). For each of the following 4 cases in the boxes below, drawa free-body diagram for the block that shows all the horizontal and vertical forces exerted on the block. Indicate whether the total work, WH1 + W H2, is positive, negative or zero. The block moves to the right and speeds up.

The block moves to the left and speeds up.

The block moves to the right and slows down.

The block moves to the left with constant speed.

C. Shown in the diagram (right) is a side view of the displacement x, that a block undergoes on a table when pushed by a hand. The horizontal force on the block by the hand , FBH is also shown.

Reproduced from “Tutorials in Introductory Physics” McDermott, Shaffer, & P.E.G, U. Washington Prentice Hall Inc. (2002)

x FBH

the block’s motion and add them to the boxes above.

Reproduced from “Tutorials in Introductory Physics”

Reproduced from “Tutorials in Introductory Physics” McDermott, Shaffer, & P.E.G, U. Washington Prentice Hall Inc. (2002)...