Three blocks, each of mass 10 kg are on a frictionless table. A hand pushes on t

Question

Three blocks, each of mass 10 kg are on a frictionless table. A hand pushes on the left most box (A) such that the three boxes accelerate in the positive horizontal direction as shown at a rate of a = 0.8 m/s2.

1)

What is the magnitude of the force on block A from the hand?

2) What is the net horizontal force on block A ?

3)What is the magnitude of the force on block B from the hand?

4)What is the horizontal force on block A due to block B?

5)What is the net horizontal force on block B?

6) What is the horizontal force on block B due to block C?

Explanation / Answer

Total mass = 30kg.
Mass of 2 blocks = 10kg.
1) Force = (ma) = (30 x .8) = 24N
2) Force = (ma) = (20 x .8) = 16N
Net force on block A = (24- 16.) = 8N.
3) Force = (ma) = (20x .8) = 16N. also.
4) Net force on block B = (20 x .8) - (10 x .8) = 8N.
5) (10 x .8) = 8N.

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