MCQs on Laws of Motion – Chapter -5

Multiple Choice Questions and Answers on Laws of Motion

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These Questions are prepared for any entrance exam which involves science objective type questions.

A. If the total external force on an object is zero, it means

1. Acceleration is zero
2. Acceleration is positive
3. Acceleration is negative
4. Acceleration is infinity

Answer 1

B. Pick the formula of momentum

p is momentum , m is mass and v is velocity

1. p = m / v
2. p = mv
3. p = (m/v)*v
4. p = mva

Answer 2

C. The rate of change of momentum of an object is 

1. Directly proportional to the applied force and takes place in the opposite direction of the force
2. Directly proportional to the applied force and takes place in the  direction of the force
3. Directly proportional to the applied force and takes place in the tangential direction of the force

   4. Directly proportional to the applied force and takes place in the circular direction of the force

Answer 2 

D. The second law of motion formula is:

F = Force

m = Mass

a= Acceleration

1. F = m/a
2. F= a/m
3. m = Fa
4. F = ma

Answer 4

E. Newton’s third law of motion states

1. The force on object X by Y and the force on object Y by object X act at the same instant
2. The force on object X by Y and the force on object Y by object X does not act at the same instant
3. The force on object X by Y and the force on object Y by object X does not act at all
4. The force on object X by Z and the force on object Y by object X act at the same instant

Answer 1

F. The second and third law of motion leads to a consequence which says that:

1. Momentum changes continuously
2. Momentum does not change and this is also known as the law of conservation of momentum
3. Momentum does not change and this is also known as the law of exposure of momentum
4. Momentum changes continuously and this is also known as the law of exposure of momentum

Answer 2

G. If applied force does not exist

1. Friction does not exist
2. Friction is 100 times the applied force
3. Friction is 10 times the applied force
4. Friction exists

Answer 1

H. Lubricants

1. Do not reduce kinetic friction in a machine
2. Reduce friction in a machine
3. Have no impact on the friction in a machine
4. Reduces friction 10 times

Answer 2

I. On a road, friction between the car and a road is needed 

1. To provide the required external force to move the car
2. To provide the required internal force to move the car
3. To provide required internal force to stop the car
4. o provide required external force to stop the car

Answer a

J. The force directed at the center is called

1. Centrifugal force
2. Centripetal force
3. Centrifugal  and Centripetal force
4. Centrifugal motion force

Answer 2

K. The formula of circular motion is:

FC = force of acceleration  

m = mass 

v = velocity

R = Radius

1. fc =mv*v / R
2. fc =mv*v * R
3. fc =mv*v / R*R
4. fc =m*mv*v / R*R

Answer 2

L Impulse is 

1. Product of force and velocity
2. Product of force and speed
3. Product of force and time
4. Product of force and momentum

Answer 3

M Impulse is

1. Change in momentum
2. Change in Speed
3. Change in Velocity
4. Change in direction

Answer 1