# Magnitude of Frictional Force in Simple Harmonic Motion

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1. Jun 10, 2017

### Rotnort

1. The problem statement, all variables and given/known data

I do not fully grasp the concept behind all of these sub questions (i)-(iv).
2. Relevant equations
v=wAcos(wt) (SMH)?
Friction Force = Coefficient of Friction * Normal Force
3. The attempt at a solution

(i) Varying as simple harmonic motion sees varying acceleration as it oscillates forwards, until a stationary point and then backwards.

(ii) Same (not varying) as block A moves with block B, in identical harmonic motion?

(iii) I think this has to do with the result of (ii), which would indicate (ii)'s correct answer is 'varying' but I am not sure why (conceptually).

(iv) as (iii)

2. Jun 10, 2017

### jbriggs444

F=ma. If a is varying, what can be said about F?

3. Jun 10, 2017

### Rotnort

I see, very simple. Thank you!

So for (iii), block A would be more likely to slip when block B is at x=d because at x=d block B would have greater acceleration (would it?)

Last edited: Jun 10, 2017
4. Jun 11, 2017

Yes!