Physics · Science General

Newtonian Mechanics and Forces

1,559 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

Multiple choice

Which of the following can be measured with a spring balance?

a. Weight of an object b. Density of an object c. Mass of an object d. Force acting on an object

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only b and d

  5. Only a and d
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. When a spring balance is held vertically, it is said to measure the weight of an object. And when a spring balance is held horizontally, it is used to measure the force acting on an object.

Multiple choice

Which of the following statements is/are false?

a. The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and gives rise to force of friction. b. Vehicles are able to move on road because of the presence of friction between their tyres and the surface of road. c. Cars and speedboats are streamlined to increase drag.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. Cars and speedboats are streamlined to reduce drag.

Multiple choice

The force required to keep an object in a circular motion is known as

  1. circular force

  2. centrifugal force

  3. centripetal force

  4. gravitational force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Centripetal force is the inward force required to keep an object moving in a circular path. It acts toward the center of the circle and is necessary because objects in motion tend to move in straight lines (Newton's first law). Without centripetal force (provided by tension, gravity, friction, etc.), an object would fly off tangentially. Centrifugal force is a fictitious outward force observed in a rotating reference frame.

Multiple choice

If a train suddenly comes to a halt, the passengers get a sudden shock due to

  1. the law of Conservation of Momentum

  2. the law of Inertia

  3. the law of Gravitation

  4. the law of Equal Action and Reaction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a moving train suddenly stops, the passengers' bodies continue moving forward due to inertia - the tendency of objects in motion to stay in motion. This sudden deceleration causes the passengers to jerk forward relative to the train, creating the sensation of a shock. The law of inertia (Newton's first law) explains this phenomenon where a body maintains its state of motion unless acted upon by an external force.

Multiple choice

Which of the following statements is/are false? a. In interaction, each object acts in such a way, so as to have an effect on the other object. b. The direction in which the object is pushed or pulled is called the direction of force. c. Force has magnitude but no direction.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Statement 'c' is a false statement. Thus, it is the correct option. Force has magnitude as well as direction.

Multiple choice

Which of the following statements is/ are false? a. The strength of a force is expressed by its direction. b. One newton is the force, which can make an object of one kilogram mass to move at a speed of one meter per second. c. If the magnitude or the direction of the applied force changes, the effect produced by the force also changes.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 'a' is a false statement. Thus, it is the correct option. The strength of a force is expressed by its magnitude, and not its direction.

Multiple choice

Which of the following is not an example of use of muscular force?

  1. A porter carrying a load on a wheel-barrow.

  2. A boy pushing a cart on the road.

  3. A child riding a bicycle.

  4. A person drawing water from the well.

  5. The stopping of a rolling ball after covering a little distance.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option, as it is not an example of use of muscular force.