Question

Two blocks are sliding, side-by-side, to the right on a frictionless surface as shown below. The blocks have inertias mA = 6 kg and mB = 4 kg. Your hand pushes on the front block, block B, with a force F^C_HB = 30 N so that the blocks slow down. v mA > mB H A B Frictionless surface Slowing (a) Draw a free-body diagram for the system containing BOTH blocks. Use Newton’s 2nd Law with this diagram to find the acceleration of the blocks. (b) Draw a free-body diagram for Block A. Use the diagram to find the magnitude of force from Block B on Block A. (c) Draw a free-body diagram for Block B. Use the diagram to find the magnitude of force from Block A on Block B. (d) Do your results in (b) and (c) agree with Newton’s 3rd Law? 

          Two blocks are sliding, side-by-side, to the right on a frictionless surface as shown
below. The blocks have inertias mA = 6 kg and mB = 4 kg. Your hand pushes on the
front block, block B, with a force F^C_HB = 30 N so that the blocks slow down.
v
mA > mB
H
A
B Frictionless surface
Slowing
(a) Draw a free-body diagram for the system containing BOTH blocks. Use Newton’s
2nd Law with this diagram to find the acceleration of the blocks.
(b) Draw a free-body diagram for Block A. Use the diagram to find the magnitude of
force from Block B on Block A.
(c) Draw a free-body diagram for Block B. Use the diagram to find the magnitude of
force from Block A on Block B.
(d) Do your results in (b) and (c) agree with Newton’s 3rd Law?
Show more…
Two blocks are sliding, side-by-side, to the right on a frictionless surface as shown below. The blocks have inertias mA = 6 kg and mB = 4 kg. Your hand pushes on the front block, block B, with a force F^CHB = 30 N so that the blocks slow down. v mA > mB H A B Frictionless surface Slowing (a) Draw a free-body diagram for the system containing BOTH blocks. Use Newton’s 2nd Law with this diagram to find the acceleration of the blocks. (b) Draw a free-body diagram for Block A. Use the diagram to find the magnitude of force from Block B on Block A. (c) Draw a free-body diagram for Block B. Use the diagram to find the magnitude of force from Block A on Block B. (d) Do your results in (b) and (c) agree with Newton’s 3rd Law?

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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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Two blocks are sliding, side-by-side, to the right on a frictionless surface as shown below. The blocks have inertias mA = 6 kg and mB = 4 kg. Your hand pushes on the front block, block B, with a force F^C_HB = 30 N so that the blocks slow down. (a) Draw a free-body diagram for the system containing BOTH blocks. Use Newton’s 2nd Law with this diagram to find the acceleration of the blocks. (b) Draw a free-body diagram for Block A. Use the diagram to find the magnitude of force from Block B on Block A. (c) Draw a free-body diagram for Block B. Use the diagram to find the magnitude of force from Block A on Block B. (d) Do your results in (b) and (c) agree with Newton’s 3rd Law?
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Transcript

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00:01 All right, so let's say we have two blocks that are sliding to the right with some speed v, but they're being pushed with a force this way by your hand.
00:10 And let's say this is block a, this is b.
00:13 We're told the mass of a is 6 kilograms.
00:17 The mass of b is 4 kilograms.
00:21 And so we want to draw a free body diagram if there's no friction.
00:26 So basically we'll have the force applied onto block b, which applies a force, you know, b, a, on to.
00:32 To a.
00:33 And that's basically it.
00:35 Of course, we'll have our normal forces and our weights, but they're not going to influence the dynamics of this problem.
00:44 So we don't need to write too much about them.
00:47 So then part b, if we draw a free body diagram just for block a, we'll have the force on block a from block b...
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