<![CDATA[Math Is Fun Forum / find the force]]> 2014-08-23T15:22:34Z FluxBB https://www.mathisfunforum.com/viewtopic.php?id=21380 <![CDATA[Re: find the force]]> wow, you explained it so easily and well.(It reminded me of bob.)

thank you ]]>
https://www.mathisfunforum.com/profile.php?id=198409 2014-08-23T15:22:34Z https://www.mathisfunforum.com/viewtopic.php?pid=329792#p329792
<![CDATA[Re: find the force]]>
Weight of m (taking
) is
.

So the frictional force required to keep m from slipping is
.

This can be supplied by a horizontal force of
.

Now the van is accelerating to the right, meaning m would be accelerating to the left relative to the van with a force of
.

Therefore the horizontal force required to pin m to M is
.

NB: The 150 N horizontal force consists of 25 N required to keep m stationary relative to the van and 125 N needed to generate the frictional force to balance its weight.

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https://www.mathisfunforum.com/profile.php?id=207651 2014-08-23T11:24:25Z https://www.mathisfunforum.com/viewtopic.php?pid=329742#p329742
<![CDATA[Re: find the force]]> I thought the the same but it is an MCQ question with options as follows:-

a)170 N
b)180 N
c)150 N
d)250 N

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https://www.mathisfunforum.com/profile.php?id=198409 2014-08-23T07:15:19Z https://www.mathisfunforum.com/viewtopic.php?pid=329681#p329681
<![CDATA[Re: find the force]]> The reaction force between m and M is 5kg*5m/s^2

To balance the friction, you must give a force of 5kg*5m/s^2*0.4

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https://www.mathisfunforum.com/profile.php?id=95904 2014-08-23T01:45:39Z https://www.mathisfunforum.com/viewtopic.php?pid=329672#p329672
<![CDATA[find the force]]> In this figure, mass M is fixed on the wall.How much force on mass m=5 kg should be applied so that it won't slip.
(given: acceleration of van=5m/s^2 ;coefficient of friction between m and M=0.4) Pls help.

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https://www.mathisfunforum.com/profile.php?id=198409 2014-08-22T16:47:44Z https://www.mathisfunforum.com/viewtopic.php?pid=329659#p329659