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2 years ago

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In a pulley system, two blocks are connected by a rope as shown below. The coefficient of static friction between block A and th

e surface is 0.8. Block A has a mass of 20kg. What is the minimum mass that block B can have so that block A moves?

1 answer:

umka21 [38]2 years ago

5 0

Hi there!

We can begin by doing a summation of forces for each block.

Block A:

This block has the force of tension (in direction of acceleration +) and static friction (opposite direction -) acting on it. Thus:

$\Sigma F_A = T - F_s\\\\m_Aa = T - \mu m_Ag$

Block B:

This block has the force of tension (opposite of acc. -) and gravity (in direction of acc +), working on it.

$\Sigma F_B = m_Bg - T\\\\ m_Ba = m_Bg - T$

Add both of the expressions and solve for the maximum mass of Block B.

$\Sigma F = m_Bg - T + T - \mu m_Ag\\\\a(m_A + m_B) = m_Bg - \mu m_Ag$

To find the minimum value, we can set a = 0, so:

$0 = m_Bg - \mu m_Ag\\\\\mu m_Ag = m_B g\\\\0.8(20)(9.8) = m_B (9.8)\\\\m_B = \frac{0.8(20)(9.8)}{9.8)} = \boxed{16 kg}$

The block must weigh <u>> 16 kg</u> for block A to move.

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