Would you please assist me with this problem the answer i...

Name: would you please assist me with this problem the answer i got is not for this problem a basket ball player jumps vertically off the rigid floor while the play is in contact with the floor a neither th
Uploaded: 2021-11-24T00:54:37-08:00
Duration: 6 min 40 s
Channel: Linda Winkler
Description: would you please assist me with this problem the answer i got is not for this problem a basket ball player jumps vertically off the rigid floor while the play is in contact with the floor a neither th

A basket ball player jumps vertically off the rigid floor. while the play is in contact with the floor a. Neither the floor nor player does work on other b. The floor does non-zero work on the player, by the player does zero work on the floor c. The floor does zero work on the player, by the player does non-zero work on the floor d. both the floor and player do non-zero work on each other, but the floor does greater amount of work e. both the floor and player do non-zero work on each other, but the floor does smaller amount of work

Transcript

00:01 So one of the things people learn about in mechanics is the concept of work.

00:08 That work is the product of a force, and that's a vector, dotted into a displacement, another vector.

00:20 So often people think that if there is a displacement and a force in the same direction, there's going to be work done.

00:29 And you want to be a little bit careful.

00:31 So the deal is really that this is a transfer of energy, and the work is coming from a force that actually moves with the object.

00:48 So the force must displace along with the object that is moving.

01:02 Okay, so an example of a force that does work.

01:07 Here's a very simple example.

01:09 You're pushing a box across the floor.

01:14 So let's draw a little person here, a little stick figure.

01:18 All right.

01:20 So as you push, you exert a force on the object, and the box moves.

01:33 You are clearly doing work.

01:36 So the person does work, the person's push because that force, push is continuing to move with the object box in this case.

02:03 Okay.

02:05 So one of the things that becomes a puzzle is can a wall or a floor do work on a person? so let's say you run into a wall and you stop, you know, and it crushes your arms or something like that or your arms fold as you run into the wall.

02:25 Or here's another example that i've drawn off to the side is, does the floor do work when you jump up? okay, so you could be playing basketball or just jumping up for fun.

02:50 And clearly, there's no work done on the floor.

03:00 No work on the floor.

03:01 Why? because the floor does not displace.

03:05 The floor doesn't move...

Question

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