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Physics Questions - Friction and Circular Motion

JEE (Mains) Physics Multiple Choice Questions

31. Static friction between two surfaces is

a) Independent of the area of contact

b) Directly proportional to the area of contact

c) Zero when there is no relative motion

d) Always less than kinetic friction

Answer: c) Zero when there is no relative motion

32. The coefficient of static friction is greater than the coefficient of kinetic friction because

a) The normal force is greater in static friction

b) The contact area is larger in static friction

c) There are more interlocking irregularities in static friction

d) The frictional force is higher for dynamic motion

Answer: c) There are more interlocking irregularities in static friction

33. A body is moving on a rough horizontal surface. The frictional force acting on the body is

a) Equal to the applied force

b) Equal to the normal force

c) Independent of the normal force

d) Equal to zero if the object is in motion

Answer: a) Equal to the applied force

34. The force required to initiate the motion of a body is

a) Kinetic friction

b) Static friction

c) Rolling friction

d) Gravitational force

Answer: b) Static friction

35. The rolling friction is typically

a) Greater than static friction

b) Greater than kinetic friction

c) Less than static friction

d) Independent of the nature of the surface

Answer: c) Less than static friction

36. A car is moving on a level circular track. The centripetal force required to keep the car in motion is provided by

a) Tension in the wheels

b) Friction between the tires and the road

c) Air resistance

d) Gravitational force

Answer: b) Friction between the tires and the road

37. The frictional force on a vehicle moving on a banked curve is directed

a) Radially outward from the center of the curve

b) Toward the center of the curve

c) Along the incline of the curve

d) Perpendicular to the surface of the road

Answer: b) Toward the center of the curve

38. The centripetal force required for uniform circular motion is given by

a) \( F = \frac{mv^2}{r} \)

b) \( F = mv^2r \)

c) \( F = m\omega^2r \)

d) \( F = \frac{m}{r^2} \)

Answer: a) \( F = \frac{mv^2}{r} \)

39. A vehicle travels on a curved road banked at an angle \(\theta\). The frictional force will assist in providing

a) Centripetal force

b) Gravitational force

c) Horizontal force

d) None of the above

Answer: a) Centripetal force

40. When a car takes a sharp turn on a banked curve, the frictional force acts to provide

a) Centripetal force

b) Gravitational force

c) Horizontal force

d) None of the above

Answer: a) Centripetal force

41. If a vehicle is on a banked road, the frictional force will

a) Assist in the circular motion if the car is moving too slowly

b) Resist the motion if the car is moving too fast

c) Both of the above

d) None of the above

Answer: c) Both of the above

42. The limiting value of static friction is equal to

a) The product of the normal force and the coefficient of kinetic friction

b) The product of the normal force and the coefficient of static friction

c) The product of the applied force and the coefficient of kinetic friction

d) The difference between the applied force and the normal force

Answer: b) The product of the normal force and the coefficient of static friction

43. When an object moves in a circle with constant speed, its acceleration is directed

a) Tangentially to the circle

b) Radially inward

c) Radially outward

d) Vertically upward

Answer: b) Radially inward

44. A car takes a turn on a flat road. If the frictional force is insufficient, the car will

a) Slip outward

b) Slip inward

c) Maintain the circular path

d) Roll over

Answer: a) Slip outward

45. The frictional force on a car going around a bend on a level road is

a) Always zero

b) Equal to the centripetal force required for the circular motion

c) Equal to the normal force acting on the car

d) Greater than the centripetal force

Answer: b) Equal to the centripetal force required for the circular motion

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JEE (Mains) Physics Multiple Choice Questions

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