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

The force of attraction between any two objects is called

  1. gravitational force

  2. frictional force

  3. electrostatic force

  4. magnetic force

  5. electromotive force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Newton all objects in the universe attract each other. This force of attraction between the objects is called gravitational force or gravity. So it is correct.

Multiple choice

When does force of friction come into play?

  1. When a body stops its movement

  2. When a body does not start its movement

  3. After sliding through some distance

  4. When a body slides or tends to do it on the surface of other body
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 When a body slides on the surface of other body.

Multiple choice

What happens when one object moves over the surface of another object?

  1. Surface of only upper object exerts force of friction on lower object.

  2. Surface of lower object exerts force of friction on upper object.

  3. Surface of both the objects exerts force on each other.

  4. Surface of both the objects exerts force in a direction opposite to each other.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Newton's third law, when two surfaces slide against each other, BOTH surfaces experience friction forces. These forces are equal in magnitude but opposite in direction - each surface exerts friction on the other. Option A incorrectly suggests only the upper object exerts friction, option B incorrectly suggests only the lower object does, and option C is incomplete. Option D correctly captures that both surfaces exert friction forces in opposite directions.

Multiple choice

How is frictional force helpful in walking?

  1. Frictional force is exerted on the ground by foot.

  2. It produces heat which helps in walking.

  3. If there was no friction, your foot would simply slide back as you tried to take steps, and you would go nowhere.

  4. It prevents the foot from slipping forward.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 If there was no friction, your foot would simply slide back as you tried to take steps, and you would go nowhere.

Multiple choice

Which of the following statements is/are true?

  1. Tyres have geometrical pattern to reduce the friction.
  2. The straps of the shoulder bags are made broad to decrease the pressure by increasing the area of contact
  3. Aeroplanes and boats have streamlined shapes to reduce the resistance offered by air and water, respectively.

  1. Only (1)

  2. Only (2)

  3. Only (1) & (3)

  4. Only (2) & (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement (1) is wrong. Tyres and soles of shoes have geometrical patterns to increase the friction. Statement (2) is correct. The straps of the shoulder bags are made broad to decrease the pressure by increasing the area of contact. Statement (3) is correct. Aeroplanes and boats have streamlined shapes to reduce the resistance offered by air and water, respectively.

Multiple choice

Consider the following statements: (1). There are chances of toppling when a truck takes a sharp turn specially when it is fully loaded because it increases the rotational force. (2). While throwing a ball upwards, the velocity remains the constant.

Which of the given statements is /are correct?

  1. Only (1)

  2. Only (2)

  3. Both (1) & (2)

  4. Neither of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement (1) is wrong. When a truck is fully loaded, its centre of gravity will be raised making it unstable. When taking a sharp turn the vertical line through the centre of gravity will fall outside the base of support, and the truck may topple over. Statement (2) is also incorrect. While throwing a ball upwards, the acceleration remains the constant.

Multiple choice

Which of the following statements is/are true? (1) When a coolie goes upstairs with a load on his head, work is said to be done. (2) A vehicle moving on a circular path experiences centrifugal force. (3) If a boy sitting in a railway train, moving at constant velocity, throws a ball straight up into the air, the ball will fall in front of him.

  1. Only (1)

  2. Only (2)

  3. Only (1) & (3)

  4. Only (2) & (3)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(1) Statement (1) is correct. When a coolie goes upstairs with a load on his head, work is done against the force of gravity. (2) Statement (2) is wrong. A vehicle moving on a circular path experiences centripetal force. (3) Statement (3) is wrong. If a boy sitting in a railway train, moving at constant velocity, throws a ball straight up into the air, the ball will fall into his hand.

Multiple choice

Consider the following statements:1. If somehow the distance between the sun and the earth is doubled, the gravitational force between them will increase.

  1. To reduce the force of friction, the carpenters use the sand paper to polish the wood.

Which of the given statements is /are correct?

  1. Only (1)

  2. Only (2)

  3. Both (1) & (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(1) Statement (1) is wrong. If the distance between sun and the earth is doubled, the gravitational force between them will become one-fourth. (2) Statement (2) is also wrong. Carpenters use the sand paper to polish the wood by increasing the force of friction.

Multiple choice

Consider the following statements:1. In a case of uniform circular motion, the acceleration is variable in magnitude but constant in direction.

  1. The force applied as push, pull, stretch and squeeze is called mechanical force.

Which of the given statements is/are incorrect?

  1. Only (1)

  2. Only (2)

  3. Both (1) & (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (1) is incorrect. In case of uniform circular motion, the acceleration is constant in magnitude and directed radial inwards. Statement (2) is also incorrect. The force applied as push, pull, stretch and squeeze is called muscular force.

Multiple choice

Mechanical waves transfer________.

  1. energy

  2. matter

  3. both (1) and (2)

  4. either (1) or (2)

  5. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mechanical waves always transfer energy from one point to another point in a medium without any physical transport of the material between these points.

Multiple choice

Two electric lines of force intersect each other.

  1. True

  2. False

  3. May be true

  4. May be false

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Two electric lines of force never intersect, because in that case at the point of intersection, there will be two tangents and hence, there would be two values of the electric field at that point, which is impossible. So, this is a correct option.