Physics · Science General

Newtonian Mechanics and Forces

1,605 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

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.

Multiple choice

Match the following:

 
a. Contact force 1. It is the force exerted by the muscles of the body.
b. Muscular force 2. It is the force, which can be exerted by an object on another object even from a distance, without touching each other.
c. Non-contact force 3. It is a force, which can be exerted by an object on another object only through physical touching.

  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 2, b - 1, c - 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Contact force is a force, which can be exerted by an object on another object only through physical touching. Muscular force is the force exerted by the muscles of the body. Non-contact force is the force, which can be exerted by an object on another object even from a distance, without touching each other.

Multiple choice

Match the following:

 
a. Frictional force 1. It is a force exerted by a magnet.
b. Magnetic force 2. It is the force exerted by an electrically charged object.
c. Electrostatic force 3. It is a force, which always opposes the motion of one body over another body.

  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 2, b - 1, c - 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Frictional force is a force, which always opposes the motion of one body over another body. Magnetic force is a force exerted by a magnet. Electrostatic force is the force exerted by an electrically charged object.

Multiple choice

Gravitation is the natural phenomenon responsible for objects with mass to

  1. repel each other

  2. attract each other

  3. explode

  4. fall on lighter objects
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gravitation is a force of attraction between all objects with mass. Every object in the universe attracts every other object - that's why things fall toward Earth and planets orbit the Sun. The force increases with mass and decreases with distance.

Multiple choice

Which of the following is a force acting on an airplane in flight?

  1. Weight

  2. Lift

  3. Thrust

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Four fundamental forces act on an aircraft in steady flight: lift (opposes weight), weight (gravity pulling down), thrust (propels forward), and drag (opposes thrust). All of these forces are constantly acting on the airplane. The question's phrasing is slightly awkward since it asks 'which is a force' (singular) but the correct answer acknowledges that all listed forces act simultaneously.

Multiple choice

Which is not a vector quantity?

  1. Speed

  2. Acceleration

  3. Force

  4. Displacement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct as it has only magnitude. So it is a scalar quantity.