A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is (1) 2 N

(2) 20 N

(3) 50 N

(4) 100 N

Concept Questions :-

Types of forces
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The coefficient of static friction, μs, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are assumed to be smooth and massless. (g = 10 m/s2 (1) 2.0 kg

(2) 4.0 kg

(3) 0.2 kg

(4) 0.4 kg

Concept Questions :-

String constraint
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If mass of A = 10 kg, coefficient of static friction = 0.2, coefficient of kinetic friction = 0.2. Then mass of B to start motion is (1) 2 kg

(2) 2.2 kg

(3) 4.8 kg

(4) 200 gm

Concept Questions :-

Application of laws
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The maximum speed that can be achieved without skidding by a car on a circular unbanked road of radius R and coefficient of static friction μ, is

(1) $\mu Rg$

(2) $Rg\sqrt{\mu }$

(3) $\mu \sqrt{Rg}$

(4) $\sqrt{\mu Rg}$

Concept Questions :-

Friction
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A car is moving along a straight horizontal road with a speed v0. If the coefficient of friction between the tyres and the road is μ, the shortest distance in which the car can be stopped is

(1) $\frac{{v}_{0}^{2}}{2\mu g}$

(2) $\frac{{v}_{0}}{\mu g}$

(3) ${\left(\frac{{v}_{0}}{\mu g}\right)}^{2}$

(4) $\frac{{v}_{0}}{\mu }$

Concept Questions :-

Friction
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Two carts of masses 200 kg and 300 kg on horizontal rails are pushed apart. Suppose the coefficient of friction between the carts and the rails are same. If the 200 kg cart travels a distance of 36 m and stops, then the distance travelled by the cart weighing 300 kg is (1) 32 m

(2) 24 m

(3) 16 m

(4) 12 m

Concept Questions :-

Friction
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A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30° to the upward drawn vertical which causes the block to just slide is

(1) 29.43 N

(2) 219.6 N

(3) 21.96 N

(4) 294.3 N

Concept Questions :-

Friction
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Assuming the coefficient of friction between the road and tyres of a car to be 0.5, the maximum speed with which the car can move round a curve of 40.0 m radius without slipping, if the road is unbanked, should be

(1) 25 m/s

(2) 19 m/s

(3) 14 m/s

(4) 11 m/s

Concept Questions :-

Friction
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Difficulty Level:

Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of kinetic friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is (g = 10 m/s2

(1) 30 m

(2) 40 m

(3) 72 m

(4) 20 m

Concept Questions :-

Friction
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On the horizontal surface of a truck (μ = 0.6), a block of mass 1 kg is placed. If the truck is accelerating at the rate of 5m/sec2 then frictional force on the block will be

(1) 5 N

(2) 6 N

(3) 5.88 N

(4) 8 N

Concept Questions :-

Pseudo force