Three blocks are in contact with one another on a frictionless, horizontal surfa

Question

Three blocks are in contact with one another on a frictionless, horizontal surface as shown in force F is applied to m1. Take m1 = 2.00 kg, m2 = 7.80 kg, m3 = 5.20 kg, and F = 23.5 N. Find the magnitudes of the contact forces between the blocks. you are working on a construction project. A coworker is nailing up plasterboard on one light partition, and you are on the opposite side, providing "backing" by leaning against the wall with your back pushing on it. Every hammer blow makes your back sting. The supervisor helps you put a heavy block of wood between the wall and your back. Explain how this change works to make your job comfortable.

Explanation / Answer

Here ,

let the acceleration of the blocks is a

Using second equation of motion

F = (m1 + m2 + m3) * a

23.5 = (2 + 7.8 + 5.2) * a

a = 1.57 m/s^2

d) for force between block 1 and 2

for the block m1

F - N12 = m1 * a

23.5 - N12 = 1.57 * 2

N12= 20.37 N

the normal force between 1 and 2 is 20.37 N

for the force between 2 and 3

for the

N23 = m3 * a

N23 = 5.20 * 1.57

N23 = 8.2 N

the force between 1 and 2 is 8.2 N

e)

using the heavy block of wood ,

makes the force acting on me less when the hammer is struck

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