Question

Block A rests on top of block B, which is pulled to the left by force F (as shown in the figure below). The table is frictionless, but there is friction between blocks A and B. a. Draw free-body diagrams for blocks A and B. Clearly label each of the forces using the notation shown to you in the book and in class. b. List which pairs of forces are action-reaction forces between blocks A and B.

          Block A rests on top of block B, which is pulled to the left by force F (as shown in the figure below). The table is frictionless, but there is friction between blocks A and B.

a. Draw free-body diagrams for blocks A and B. Clearly label each of the forces using the notation shown to you in the book and in class.

b. List which pairs of forces are action-reaction forces between blocks A and B.

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Added by Rachel S.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Pritesh Ranjan

09/27/2021

Step 1

**Block A:** - Weight (W_A) acting downwards - Normal force (N_A) acting upwards - Friction force (f) acting to the right **Block B:** - Weight (W_B) acting downwards - Normal force (N_B) acting upwards - Friction force (f) acting to the left **Step 2:** List Show more…

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Block A rests on top of block B, which is pulled to the left by force F (as shown in the figure below). The table is frictionless, but there is friction between blocks A and B. a. Draw free-body diagrams for blocks A and B. Clearly label each of the forces using the notation shown to you in the book and in class. b. List which pairs of forces are action-reaction forces between blocks A and B.

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Transcript

00:01 In this problem we have been given that there are two blocks.

00:04 Block a is resting on the top of block b, and block b is over the surface of the table here.

00:14 So we need to draw the free body diagram of both these blocks.

00:22 So observing block a.

00:24 On block a, there will be the weight of this block a.

00:28 So that will be, let's say, wa.

00:30 And there will be normal force on this block a because of the surface of these two blocks in contact.

00:38 So that normal force, let's say it is nb, which is the normal force provided by block.

00:45 And here, the surface of the table is frictionless, but yes, there is given a friction between block a and block b.

00:53 Also, there is a force applied on this block b.

00:58 So block a will have tendency to slip in the backward direction.

01:02 So as a result, the friction force on a will be to the right.

01:07 So let's say this is the friction force represented by small f.

01:12 Talking about block b, there will be weight of this block b.

01:17 There will be normal force applied on this block b because of the surface in contact with the ground.

01:23 So let's say that normal force is ng.

01:26 And there will be normal force acting in the downward direction.

01:30 That will be provided by the surface of the surface...

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