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

146223 A body A of mass \(1 \mathrm{~kg}\) rests on a smooth surface. Another body \(B\) of mass \(0.2 \mathrm{~kg}\) is placed over \(A\) as shown. The coefficient of static friction between \(A\) and \(B\) is 0.15 . B will begin to slide on \(A\), if \(A\) is pulled with a force greater than

1 \(1.764 \mathrm{~N}\)
2 \(0.1764 \mathrm{~N}\)
3 \(0.3 \mathrm{~N}\)
4 It will not slide for any \(\mathrm{F}\)
Laws of Motion

146225 A body is coming with a velocity of \(72 \mathrm{~km} / \mathrm{h}\) on a rough horizontal surface with a coefficient of friction 0.5 . If the acceleration due to gravity is \(10 \mathrm{~m} / \mathrm{s}^{2}\), find the minimum distance it can be stopped.

1 \(400 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(0.40 \mathrm{~m}\)
4 \(4 \mathrm{~m}\)
Laws of Motion

146226 A body of weight \(50 \mathrm{~N}\) placed on a horizontal surface is just moved by a force of \(28.2 \mathrm{~N}\). The frictional force and normal reaction are

1 \(2 \mathrm{~N}, 3 \mathrm{~N}\)
2 \(5 \mathrm{~N}, 6 \mathrm{~N}\)
3 \(10 \mathrm{~N}, 15 \mathrm{~N}\)
4 \(20 \mathrm{~N}, 30 \mathrm{~N}\)
Laws of Motion

146227 A block \(B\) is pushed momentarily along a horizontal surface with an initial velocity \(V\). If \(\mu\) is the coefficient of sliding friction between \(B\) and the surface, block \(B\) will come to rest after a time

1 \(\frac{V}{g \mu}\)
2 \(\frac{g \mu}{V}\)
3 \(\frac{\mathrm{g}}{\mathrm{V}}\)
4 \(\frac{\mathrm{V}}{\mathrm{g}}\)
Laws of Motion

146223 A body A of mass \(1 \mathrm{~kg}\) rests on a smooth surface. Another body \(B\) of mass \(0.2 \mathrm{~kg}\) is placed over \(A\) as shown. The coefficient of static friction between \(A\) and \(B\) is 0.15 . B will begin to slide on \(A\), if \(A\) is pulled with a force greater than

1 \(1.764 \mathrm{~N}\)
2 \(0.1764 \mathrm{~N}\)
3 \(0.3 \mathrm{~N}\)
4 It will not slide for any \(\mathrm{F}\)
Laws of Motion

146225 A body is coming with a velocity of \(72 \mathrm{~km} / \mathrm{h}\) on a rough horizontal surface with a coefficient of friction 0.5 . If the acceleration due to gravity is \(10 \mathrm{~m} / \mathrm{s}^{2}\), find the minimum distance it can be stopped.

1 \(400 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(0.40 \mathrm{~m}\)
4 \(4 \mathrm{~m}\)
Laws of Motion

146226 A body of weight \(50 \mathrm{~N}\) placed on a horizontal surface is just moved by a force of \(28.2 \mathrm{~N}\). The frictional force and normal reaction are

1 \(2 \mathrm{~N}, 3 \mathrm{~N}\)
2 \(5 \mathrm{~N}, 6 \mathrm{~N}\)
3 \(10 \mathrm{~N}, 15 \mathrm{~N}\)
4 \(20 \mathrm{~N}, 30 \mathrm{~N}\)
Laws of Motion

146227 A block \(B\) is pushed momentarily along a horizontal surface with an initial velocity \(V\). If \(\mu\) is the coefficient of sliding friction between \(B\) and the surface, block \(B\) will come to rest after a time

1 \(\frac{V}{g \mu}\)
2 \(\frac{g \mu}{V}\)
3 \(\frac{\mathrm{g}}{\mathrm{V}}\)
4 \(\frac{\mathrm{V}}{\mathrm{g}}\)
Laws of Motion

146223 A body A of mass \(1 \mathrm{~kg}\) rests on a smooth surface. Another body \(B\) of mass \(0.2 \mathrm{~kg}\) is placed over \(A\) as shown. The coefficient of static friction between \(A\) and \(B\) is 0.15 . B will begin to slide on \(A\), if \(A\) is pulled with a force greater than

1 \(1.764 \mathrm{~N}\)
2 \(0.1764 \mathrm{~N}\)
3 \(0.3 \mathrm{~N}\)
4 It will not slide for any \(\mathrm{F}\)
Laws of Motion

146225 A body is coming with a velocity of \(72 \mathrm{~km} / \mathrm{h}\) on a rough horizontal surface with a coefficient of friction 0.5 . If the acceleration due to gravity is \(10 \mathrm{~m} / \mathrm{s}^{2}\), find the minimum distance it can be stopped.

1 \(400 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(0.40 \mathrm{~m}\)
4 \(4 \mathrm{~m}\)
Laws of Motion

146226 A body of weight \(50 \mathrm{~N}\) placed on a horizontal surface is just moved by a force of \(28.2 \mathrm{~N}\). The frictional force and normal reaction are

1 \(2 \mathrm{~N}, 3 \mathrm{~N}\)
2 \(5 \mathrm{~N}, 6 \mathrm{~N}\)
3 \(10 \mathrm{~N}, 15 \mathrm{~N}\)
4 \(20 \mathrm{~N}, 30 \mathrm{~N}\)
Laws of Motion

146227 A block \(B\) is pushed momentarily along a horizontal surface with an initial velocity \(V\). If \(\mu\) is the coefficient of sliding friction between \(B\) and the surface, block \(B\) will come to rest after a time

1 \(\frac{V}{g \mu}\)
2 \(\frac{g \mu}{V}\)
3 \(\frac{\mathrm{g}}{\mathrm{V}}\)
4 \(\frac{\mathrm{V}}{\mathrm{g}}\)
Laws of Motion

146223 A body A of mass \(1 \mathrm{~kg}\) rests on a smooth surface. Another body \(B\) of mass \(0.2 \mathrm{~kg}\) is placed over \(A\) as shown. The coefficient of static friction between \(A\) and \(B\) is 0.15 . B will begin to slide on \(A\), if \(A\) is pulled with a force greater than

1 \(1.764 \mathrm{~N}\)
2 \(0.1764 \mathrm{~N}\)
3 \(0.3 \mathrm{~N}\)
4 It will not slide for any \(\mathrm{F}\)
Laws of Motion

146225 A body is coming with a velocity of \(72 \mathrm{~km} / \mathrm{h}\) on a rough horizontal surface with a coefficient of friction 0.5 . If the acceleration due to gravity is \(10 \mathrm{~m} / \mathrm{s}^{2}\), find the minimum distance it can be stopped.

1 \(400 \mathrm{~m}\)
2 \(40 \mathrm{~m}\)
3 \(0.40 \mathrm{~m}\)
4 \(4 \mathrm{~m}\)
Laws of Motion

146226 A body of weight \(50 \mathrm{~N}\) placed on a horizontal surface is just moved by a force of \(28.2 \mathrm{~N}\). The frictional force and normal reaction are

1 \(2 \mathrm{~N}, 3 \mathrm{~N}\)
2 \(5 \mathrm{~N}, 6 \mathrm{~N}\)
3 \(10 \mathrm{~N}, 15 \mathrm{~N}\)
4 \(20 \mathrm{~N}, 30 \mathrm{~N}\)
Laws of Motion

146227 A block \(B\) is pushed momentarily along a horizontal surface with an initial velocity \(V\). If \(\mu\) is the coefficient of sliding friction between \(B\) and the surface, block \(B\) will come to rest after a time

1 \(\frac{V}{g \mu}\)
2 \(\frac{g \mu}{V}\)
3 \(\frac{\mathrm{g}}{\mathrm{V}}\)
4 \(\frac{\mathrm{V}}{\mathrm{g}}\)
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