Three blocks, each of mass 12 kg are on a frictionless table. A hand pushes on t

Question

Three blocks, each of mass 12 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 = 1.2 m/s2.

1)

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

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2)

What is the net horizontal force on block A ?N

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3)

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

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4)

What is the net horizontal force on block B?N

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5)

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

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6)

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Explanation / Answer

Total mass = 36 kg.
Mass of 2 blocks = 24 kg.
1) Force = (ma) = (36 x 1.2) = 43.2 N.
2) Force = (ma) = (24 x 1.2) = 28.8 N.
Net force on block A = (43.2 - 28.8) = 14.4 N.
3) Force = (ma) = (24 x 1.2) = 28.8 N. also.
4) Net force on block B = (24 x 1.2) - (12 x 1.2) = 14.4 N.
5) (12 x 1.2) = 14.4 N.

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