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Assertion: A car moving on a horizontal road may be thrown out of the road in taking a turn due to lack of proper centripetal force.

Reason: If a particle moves in a circle, describing equal angles in equal intervals of time. Then the velocity vector changes its magnitude.

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Important Questions on Friction

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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 1>Q 1

Calculate the work done in pulling an object with a constant force F as shown in the figure so that the block moves with a constant velocity through a distance d. (given that the ground is rough with a coefficient of friction μ)
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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 2>Q 1

A car is moving along a hilly road as shown (side view). The coefficient of static friction between the tyres and the pavement is constant and the car maintains a steady speed. If at one of the points shown the driver applies brakes as hard as possible without making the tyres slip, the magnitude of the frictional force immediately after the brakes are applied will be maximum if the car was at :

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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 3>Q 1
A body of mass 5 kg is placed on a rough horizontal surface. If coefficients of static and kinetic friction are 0.5 and 0.4 respectively, then find value of force of friction when external applied horizontal force is (i) 15 N (ii) 25 N and (iii) 35 N.
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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 4>Q 1
A body of mass 5 kg is placed on a rough horizontal surface. If coefficient of friction is 13, find what pulling force should act on the body at an angle 30° to the horizontal so that the body just begins to move.
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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 4>Q 2
A body of mass 0.1 kg is pressed against a wall with a horizontal force 5 N. If the coefficient of friction is 0.5 then find the force of friction.
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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 4>Q 3
A body sliding on ice with a velocity of 8 m s-1 comes to rest after travelling 40 m. Find the coefficient of friction (g=9.8 m s-2).
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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 4>Q 4
What is the acceleration of the block and trolley system shown in the figure? If the coefficient of kinetic friction between the trolley and the surface is 0.04? What is the tension in the string? (Take g=10 m s-2). Neglect the mass of the string.
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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>BEGINNER'S BOX - 5>Q 1
Is it unreasonable to expect the coefficient of friction to exceed unity?