- #1
zorro
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Homework Statement
Find the accelerations of the blocks shown in the figure when a force of 10N acts on the lower block.
The Attempt at a Solution
For the 3kg block, by drawing F.B.D. we get
3a = (0.3)x5x10
a=5m/s2
Similarly for the block of mass 7 kg, we get
7a = 10 - 5x0.3x10 = -5!
I don't understand what is my mistake.
When 10N force acts on the lower block, its motion is opposed by the friction due to the 3 kg block. The maximum value of this friction is 15N. So I don't think that the lower block or any other block will move.
But the answer is different.