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MCQs - Laws of Motion

Multiple Choice Questions - Laws of Motion (Questions 61-75)

61. Which of the following best defines inertia?

a) The ability to resist acceleration

b) The ability to maintain constant velocity

c) The tendency of an object to resist any change in its state of motion

d) The force that opposes the motion of an object

Answer: c) The tendency of an object to resist any change in its state of motion

62. Newton's first law of motion is also called the law of:

a) Force and acceleration

b) Conservation of momentum

c) Inertia

d) Action and reaction

Answer: c) Inertia

63. If a body is moving with constant velocity, then according to Newton's first law:

a) No external force is acting on it

b) The velocity will decrease

c) A net external force is acting on it

d) The body will continue to move in a circle

Answer: a) No external force is acting on it

64. The rate of change of momentum of a body is directly proportional to:

a) The velocity of the body

b) The applied force

c) The distance traveled

d) The acceleration

Answer: b) The applied force

65. The impulse experienced by an object is defined as:

a) The product of the mass and velocity

b) The change in velocity

c) The force applied over a period of time

d) The change in momentum

Answer: d) The change in momentum

66. Newton's second law of motion is expressed as:

a) F = ma

b) F = mv

c) F = ma²

d) F = m/a

Answer: a) F = ma

67. The action and reaction forces described by Newton's third law are:

a) Equal and opposite but act on the same object

b) Equal and opposite but act on different objects

c) Unequal and opposite but act on different objects

d) Equal and opposite but do not have the same magnitude

Answer: b) Equal and opposite but act on different objects

68. The law of conservation of linear momentum is applicable in a system:

a) Where only internal forces act

b) Where only external forces act

c) In all conditions regardless of the forces

d) Where no forces act

Answer: a) Where only internal forces act

69. Two objects of mass m and 2m collide. If the collision is perfectly elastic, the total momentum before and after the collision will:

a) Decrease

b) Remain constant

c) Increase

d) Become zero

Answer: b) Remain constant

70. The force of friction that opposes the motion of an object that is already in motion is called:

a) Rolling friction

b) Static friction

c) Kinetic friction

d) Limiting friction

Answer: c) Kinetic friction

71. The force that must be overcome to initiate the motion of an object at rest is called:

a) Rolling friction

b) Kinetic friction

c) Limiting friction

d) Static friction

Answer: d) Static friction

72. The coefficient of friction is defined as the ratio of:

a) The weight of the object to the normal force

b) The normal force to the weight of the object

c) The frictional force to the normal force

d) The applied force to the weight of the object

Answer: c) The frictional force to the normal force

73. Rolling friction is generally:

a) Zero

b) Greater than sliding friction

c) Less than sliding friction

d) Equal to sliding friction

Answer: c) Less than sliding friction

74. The centripetal force required for an object moving in a circular path is directed:

a) Away from the center of the circle

b) Tangential to the path

c) Towards the center of the circle

d) In the direction of motion

Answer: c) Towards the center of the circle

75. For a car moving on a banked road, the frictional force:

a) Helps in preventing the car from slipping outward

b) Helps in preventing the car from sliding inward

c) Is not required as the car is moving at a constant speed

d) Helps in increasing the velocity of the car

Answer: a) Helps in preventing the car from slipping outward

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