04. Friction, and Inclined Plane Friction Motion
Laws of Motion

146210 A block moving on a surface with velocity 20 \(\mathrm{m} / \mathrm{s}\) comes to rest because of surface friction over a distance of \(40 \mathrm{~m}\). Taking \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\), the coefficient of dynamic friction is:

1 0.5
2 0.3
3 0.2
4 0.1
Laws of Motion

146211 A block of mass \(M=10 \mathrm{~kg}\) rests on a horizontal table. The coefficient of friction between the block and table is 0.05 , when hit by a bullet of mass \(50 \mathrm{~g}\) moving with speed \(v\), that gets embedded in it, the block moves and comes to stop after moving a distance of \(2 \mathrm{~m}\) on the table. If a freely falling object were to acquire speed \(\frac{v}{10}\) after being dropped from height \(H\), then neglecting energy losses and taking \(g=10 \mathrm{~ms}^{-2}\), the value of \(\mathrm{H}\) is close to

1 \(0.02 \mathrm{~km}\)
2 \(0.03 \mathrm{~km}\)
3 \(0.04 \mathrm{~km}\)
4 \(0.05 \mathrm{~km}\)
Laws of Motion

146212 A block of mass \(M\) is pulled by a force \(F\) in the direction at an angle \(\theta\) from the horizontal surface. Friction coefficient between block and surface is \(\mu\). The value of force \(F\) is

1 \(\mu \mathrm{Mg}\)
2 \(\frac{\mu \mathrm{Mg}}{1+\mu \sin \theta}\)
3 \(\frac{\mu \mathrm{Mg}}{\cos \theta+\mu \sin \theta}\)
4 None of the above
Laws of Motion

146213 In the diagram below, a body of mass \(M=5 \mathrm{~kg}\) placed on a horizontal surface is pulled by a force \(F=40 \mathrm{~N}\) in a direction making an angle \(30^{\circ}\) with the horizontal. If \(g=10 \mathrm{~ms}^{-2}\) and coefficient of friction between the body and surface is 0.2 , the acceleration acquired by the body will be

1 \(5.75 \mathrm{~ms}^{-2}\)
2 \(8.0 \mathrm{~ms}^{-2}\)
3 \(3.17 \mathrm{~ms}^{-2}\)
4 \(10.0 \mathrm{~ms}^{-2}\)
Laws of Motion

146214 In the diagram below, a block A of mass \(10 \mathrm{~kg}\) rests on a horizontal table. A mass-less string attached with it passes over a frictionless pulley attached at the end of table with another block \(B\) at its free end. If coefficient of friction between the block \(A\) and table surface is 0.2 , the minimum mass of block \(B\) needed to start motion is block \(A\) is

1 \(2 \mathrm{~kg}\)
2 \(0.2 \mathrm{~kg}\)
3 \(5 \mathrm{~kg}\)
4 \(10 \mathrm{~kg}\)
Laws of Motion

146210 A block moving on a surface with velocity 20 \(\mathrm{m} / \mathrm{s}\) comes to rest because of surface friction over a distance of \(40 \mathrm{~m}\). Taking \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\), the coefficient of dynamic friction is:

1 0.5
2 0.3
3 0.2
4 0.1
Laws of Motion

146211 A block of mass \(M=10 \mathrm{~kg}\) rests on a horizontal table. The coefficient of friction between the block and table is 0.05 , when hit by a bullet of mass \(50 \mathrm{~g}\) moving with speed \(v\), that gets embedded in it, the block moves and comes to stop after moving a distance of \(2 \mathrm{~m}\) on the table. If a freely falling object were to acquire speed \(\frac{v}{10}\) after being dropped from height \(H\), then neglecting energy losses and taking \(g=10 \mathrm{~ms}^{-2}\), the value of \(\mathrm{H}\) is close to

1 \(0.02 \mathrm{~km}\)
2 \(0.03 \mathrm{~km}\)
3 \(0.04 \mathrm{~km}\)
4 \(0.05 \mathrm{~km}\)
Laws of Motion

146212 A block of mass \(M\) is pulled by a force \(F\) in the direction at an angle \(\theta\) from the horizontal surface. Friction coefficient between block and surface is \(\mu\). The value of force \(F\) is

1 \(\mu \mathrm{Mg}\)
2 \(\frac{\mu \mathrm{Mg}}{1+\mu \sin \theta}\)
3 \(\frac{\mu \mathrm{Mg}}{\cos \theta+\mu \sin \theta}\)
4 None of the above
Laws of Motion

146213 In the diagram below, a body of mass \(M=5 \mathrm{~kg}\) placed on a horizontal surface is pulled by a force \(F=40 \mathrm{~N}\) in a direction making an angle \(30^{\circ}\) with the horizontal. If \(g=10 \mathrm{~ms}^{-2}\) and coefficient of friction between the body and surface is 0.2 , the acceleration acquired by the body will be

1 \(5.75 \mathrm{~ms}^{-2}\)
2 \(8.0 \mathrm{~ms}^{-2}\)
3 \(3.17 \mathrm{~ms}^{-2}\)
4 \(10.0 \mathrm{~ms}^{-2}\)
Laws of Motion

146214 In the diagram below, a block A of mass \(10 \mathrm{~kg}\) rests on a horizontal table. A mass-less string attached with it passes over a frictionless pulley attached at the end of table with another block \(B\) at its free end. If coefficient of friction between the block \(A\) and table surface is 0.2 , the minimum mass of block \(B\) needed to start motion is block \(A\) is

1 \(2 \mathrm{~kg}\)
2 \(0.2 \mathrm{~kg}\)
3 \(5 \mathrm{~kg}\)
4 \(10 \mathrm{~kg}\)
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Laws of Motion

146210 A block moving on a surface with velocity 20 \(\mathrm{m} / \mathrm{s}\) comes to rest because of surface friction over a distance of \(40 \mathrm{~m}\). Taking \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\), the coefficient of dynamic friction is:

1 0.5
2 0.3
3 0.2
4 0.1
Laws of Motion

146211 A block of mass \(M=10 \mathrm{~kg}\) rests on a horizontal table. The coefficient of friction between the block and table is 0.05 , when hit by a bullet of mass \(50 \mathrm{~g}\) moving with speed \(v\), that gets embedded in it, the block moves and comes to stop after moving a distance of \(2 \mathrm{~m}\) on the table. If a freely falling object were to acquire speed \(\frac{v}{10}\) after being dropped from height \(H\), then neglecting energy losses and taking \(g=10 \mathrm{~ms}^{-2}\), the value of \(\mathrm{H}\) is close to

1 \(0.02 \mathrm{~km}\)
2 \(0.03 \mathrm{~km}\)
3 \(0.04 \mathrm{~km}\)
4 \(0.05 \mathrm{~km}\)
Laws of Motion

146212 A block of mass \(M\) is pulled by a force \(F\) in the direction at an angle \(\theta\) from the horizontal surface. Friction coefficient between block and surface is \(\mu\). The value of force \(F\) is

1 \(\mu \mathrm{Mg}\)
2 \(\frac{\mu \mathrm{Mg}}{1+\mu \sin \theta}\)
3 \(\frac{\mu \mathrm{Mg}}{\cos \theta+\mu \sin \theta}\)
4 None of the above
Laws of Motion

146213 In the diagram below, a body of mass \(M=5 \mathrm{~kg}\) placed on a horizontal surface is pulled by a force \(F=40 \mathrm{~N}\) in a direction making an angle \(30^{\circ}\) with the horizontal. If \(g=10 \mathrm{~ms}^{-2}\) and coefficient of friction between the body and surface is 0.2 , the acceleration acquired by the body will be

1 \(5.75 \mathrm{~ms}^{-2}\)
2 \(8.0 \mathrm{~ms}^{-2}\)
3 \(3.17 \mathrm{~ms}^{-2}\)
4 \(10.0 \mathrm{~ms}^{-2}\)
Laws of Motion

146214 In the diagram below, a block A of mass \(10 \mathrm{~kg}\) rests on a horizontal table. A mass-less string attached with it passes over a frictionless pulley attached at the end of table with another block \(B\) at its free end. If coefficient of friction between the block \(A\) and table surface is 0.2 , the minimum mass of block \(B\) needed to start motion is block \(A\) is

1 \(2 \mathrm{~kg}\)
2 \(0.2 \mathrm{~kg}\)
3 \(5 \mathrm{~kg}\)
4 \(10 \mathrm{~kg}\)
Laws of Motion

146210 A block moving on a surface with velocity 20 \(\mathrm{m} / \mathrm{s}\) comes to rest because of surface friction over a distance of \(40 \mathrm{~m}\). Taking \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\), the coefficient of dynamic friction is:

1 0.5
2 0.3
3 0.2
4 0.1
Laws of Motion

146211 A block of mass \(M=10 \mathrm{~kg}\) rests on a horizontal table. The coefficient of friction between the block and table is 0.05 , when hit by a bullet of mass \(50 \mathrm{~g}\) moving with speed \(v\), that gets embedded in it, the block moves and comes to stop after moving a distance of \(2 \mathrm{~m}\) on the table. If a freely falling object were to acquire speed \(\frac{v}{10}\) after being dropped from height \(H\), then neglecting energy losses and taking \(g=10 \mathrm{~ms}^{-2}\), the value of \(\mathrm{H}\) is close to

1 \(0.02 \mathrm{~km}\)
2 \(0.03 \mathrm{~km}\)
3 \(0.04 \mathrm{~km}\)
4 \(0.05 \mathrm{~km}\)
Laws of Motion

146212 A block of mass \(M\) is pulled by a force \(F\) in the direction at an angle \(\theta\) from the horizontal surface. Friction coefficient between block and surface is \(\mu\). The value of force \(F\) is

1 \(\mu \mathrm{Mg}\)
2 \(\frac{\mu \mathrm{Mg}}{1+\mu \sin \theta}\)
3 \(\frac{\mu \mathrm{Mg}}{\cos \theta+\mu \sin \theta}\)
4 None of the above
Laws of Motion

146213 In the diagram below, a body of mass \(M=5 \mathrm{~kg}\) placed on a horizontal surface is pulled by a force \(F=40 \mathrm{~N}\) in a direction making an angle \(30^{\circ}\) with the horizontal. If \(g=10 \mathrm{~ms}^{-2}\) and coefficient of friction between the body and surface is 0.2 , the acceleration acquired by the body will be

1 \(5.75 \mathrm{~ms}^{-2}\)
2 \(8.0 \mathrm{~ms}^{-2}\)
3 \(3.17 \mathrm{~ms}^{-2}\)
4 \(10.0 \mathrm{~ms}^{-2}\)
Laws of Motion

146214 In the diagram below, a block A of mass \(10 \mathrm{~kg}\) rests on a horizontal table. A mass-less string attached with it passes over a frictionless pulley attached at the end of table with another block \(B\) at its free end. If coefficient of friction between the block \(A\) and table surface is 0.2 , the minimum mass of block \(B\) needed to start motion is block \(A\) is

1 \(2 \mathrm{~kg}\)
2 \(0.2 \mathrm{~kg}\)
3 \(5 \mathrm{~kg}\)
4 \(10 \mathrm{~kg}\)
Laws of Motion

146210 A block moving on a surface with velocity 20 \(\mathrm{m} / \mathrm{s}\) comes to rest because of surface friction over a distance of \(40 \mathrm{~m}\). Taking \(\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)\), the coefficient of dynamic friction is:

1 0.5
2 0.3
3 0.2
4 0.1
Laws of Motion

146211 A block of mass \(M=10 \mathrm{~kg}\) rests on a horizontal table. The coefficient of friction between the block and table is 0.05 , when hit by a bullet of mass \(50 \mathrm{~g}\) moving with speed \(v\), that gets embedded in it, the block moves and comes to stop after moving a distance of \(2 \mathrm{~m}\) on the table. If a freely falling object were to acquire speed \(\frac{v}{10}\) after being dropped from height \(H\), then neglecting energy losses and taking \(g=10 \mathrm{~ms}^{-2}\), the value of \(\mathrm{H}\) is close to

1 \(0.02 \mathrm{~km}\)
2 \(0.03 \mathrm{~km}\)
3 \(0.04 \mathrm{~km}\)
4 \(0.05 \mathrm{~km}\)
Laws of Motion

146212 A block of mass \(M\) is pulled by a force \(F\) in the direction at an angle \(\theta\) from the horizontal surface. Friction coefficient between block and surface is \(\mu\). The value of force \(F\) is

1 \(\mu \mathrm{Mg}\)
2 \(\frac{\mu \mathrm{Mg}}{1+\mu \sin \theta}\)
3 \(\frac{\mu \mathrm{Mg}}{\cos \theta+\mu \sin \theta}\)
4 None of the above
Laws of Motion

146213 In the diagram below, a body of mass \(M=5 \mathrm{~kg}\) placed on a horizontal surface is pulled by a force \(F=40 \mathrm{~N}\) in a direction making an angle \(30^{\circ}\) with the horizontal. If \(g=10 \mathrm{~ms}^{-2}\) and coefficient of friction between the body and surface is 0.2 , the acceleration acquired by the body will be

1 \(5.75 \mathrm{~ms}^{-2}\)
2 \(8.0 \mathrm{~ms}^{-2}\)
3 \(3.17 \mathrm{~ms}^{-2}\)
4 \(10.0 \mathrm{~ms}^{-2}\)
Laws of Motion

146214 In the diagram below, a block A of mass \(10 \mathrm{~kg}\) rests on a horizontal table. A mass-less string attached with it passes over a frictionless pulley attached at the end of table with another block \(B\) at its free end. If coefficient of friction between the block \(A\) and table surface is 0.2 , the minimum mass of block \(B\) needed to start motion is block \(A\) is

1 \(2 \mathrm{~kg}\)
2 \(0.2 \mathrm{~kg}\)
3 \(5 \mathrm{~kg}\)
4 \(10 \mathrm{~kg}\)