Minimal horizontal force , to hold a block against another

Apr 2015
1,136
294
Somerset, England
So have you done the first part (using symbols only; numbers are not necessary for this part )

When you have done this, what does substituting the given numerical values into your equations give you?

And please turn your pictures the right way round in future.
It will encourage others to answer as well.

image0 (1).jpeg
 
Oct 2017
642
330
Glasgow
Have you tried step a) first? That's basically the first step to solving the problem. You can't do b) without doing it.
 
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