# Impending motion vs start to slide

1. Oct 26, 2015

### goldfish9776

1. The problem statement, all variables and given/known data
what is the difference between the first and second question ? aren't they the same ?

2. Relevant equations

3. The attempt at a solution

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2. Oct 26, 2015

### BvU

To me they are. What a strange block this is! More than 300 m high and only 50 kg !
This a real exercise in a real book or some kind of garbled home-made thingy ?

3. Oct 26, 2015

### TSny

There is another type of motion that you can investigate other than sliding, namely tipping. That might be what part (a) is referring to.

It appears to me that the answers are switched. The answer listed for (b) seems to be the answer for (a) if you assume no sliding and only tipping.

The problem is odd. I don't think the block can be on the verge of tipping without also sliding.

4. Oct 26, 2015

### goldfish9776

well , what s the condition for tipping ?

5. Oct 26, 2015

### BvU

Your call ! At what angle does the thing keel over ?