Physics ยท 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

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

The magnitude of the force between charges depends upon

  1. the magnitude of the charges

  2. the distance between the charges

  3. both (1) and (2)

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

Both (1) and (2) are true as the force between charges depends upon the magnitude of charges and distance between the charges. SO 3rd option is true.

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.

Multiple choice

Which of the following statements about force is false?

  1. At least two objects must interact for a force to take place.

  2. Force has only magnitude.

  3. Forces applied on an object in the same direction add to one another.

  4. More than one force may act on an object.

  5. If two forces act in opposite directions on an object, the net force, acting on it, is the difference between the two forces.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The statement is false.

Multiple choice

Which of the following is an example of contact force?

  1. Like poles of magnets repelling each other

  2. Straw rubbed with paper attracting another straw, which is not rubbed with paper

  3. Pressing a lump of dough to make chapatti balls

  4. Water flowing down from a tap

  5. Electromagnets being used to pick up metallic scrap
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pressing a lump of dough to make chapatti balls is due to muscular force (contact force).

Multiple choice

Force acting per unit area of a surface is called

  1. friction

  2. gravity

  3. volume

  4. magnetism

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

Pressure is defined as force acting per unit area. Its S.I unit is Pascal (or newton per square metre). Thus, it is the correct option.