# Answer to Question #768 in Mechanics | Relativity for brian

Question #768

Two blocks connected by a string are pulled

across a rough horizontal surface by a force

applied to one of the blocks, as shown.

The acceleration of gravity is 9.8 m/s2

If each block has an acceleration of 2.5 m/s2

to the right, what is the magnitude of the

applied force?

Answer in units of N.

across a rough horizontal surface by a force

applied to one of the blocks, as shown.

The acceleration of gravity is 9.8 m/s2

If each block has an acceleration of 2.5 m/s2

to the right, what is the magnitude of the

applied force?

Answer in units of N.

Expert's answer

There are the force of friction (μ* m *g) and the tension of the string T acting on each block acts.

For the first block the equation of the forces would be:

F- T - μ* m *g = ma

for the second block:

T - μ * m *g = ma

F - 2 μ * m *g = 2 ma

F = 2m (a + μ*g).

So for the completion of this question we have to know the coefficient of friction and the mass of blocks.

For the first block the equation of the forces would be:

F- T - μ* m *g = ma

for the second block:

T - μ * m *g = ma

F - 2 μ * m *g = 2 ma

F = 2m (a + μ*g).

So for the completion of this question we have to know the coefficient of friction and the mass of blocks.

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