Angle of Friction

Q.

Find the maximum mass $m_2$ that can be hanged from the pulley such that the system remains in equilibrium. Coefficient of friction between block $m_1$ & wedge is $mu$.

1. $m_2=m_1(sin\theta +\mu cos\theta )$

2. $m_2=m_1(sin\theta -\mu cos\theta )$

3. $m_2=\frac{m_1}{(sin\theta +\mu cos\theta )}$

4. $m_2=\frac{m_1}{(sin\theta -\mu cos\theta )}$

Q. A force of $30\text{N}$ is sufficient just to pull a block of mass $4\text{kg}$, horizontally over a flat rough surface. The angle of friction is

1. ${45}^{\circ }$
2. ${53}^{\circ }$
3. ${37}^{\circ }$
4. ${30}^{\circ }$

Q.

Find the maximum mass $m_2$ that can be hanged from the pulley such that the system remains in equilibrium. Coefficient of friction between block $m_1$ & wedge is $mu$.

1. $m_2=m_1(sin\theta +\mu cos\theta )$

2. $m_2=m_1(sin\theta -\mu cos\theta )$

3. $m_2=\frac{m_1}{(sin\theta +\mu cos\theta )}$

4. $m_2=\frac{m_1}{(sin\theta -\mu cos\theta )}$