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

Which of the following statements is/are false?

a. The interlocking of irregularities on the two surfaces opposes the motion of one object over another and gives rise to force of friction. b. Sliding friction comes into play when an object is moving over another object. c. The more the roughness of a surface, the larger is the number of irregularities on its surface and hence, the lesser will be the friction.

  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. The more the roughness of a surface, the larger is the number of irregularities on its surface and hence, the greater will be the friction.

Multiple choice

Which of the following statements is/are false?

a. Ball bearing is a device that usually converts rolling friction into sliding friction. b. A body shape that offers very little resistance to the flow of air or water around it is called streamlined shape. c. Drag is the frictional force that is exerted by a fluid.

  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

This is the correct option as this statement is false. Ball bearing is a device that usually converts sliding friction into rolling friction.

Multiple choice

Which of the following statements is false?

  1. Aeroplanes are designed in such a way so that they can increase fluid friction.

  2. The larger the size of an object moving through a fluid, the greater will be the drag acting on it.

  3. The objects having streamlined shapes face much less drag when moving through a fluid than the objects which do not have streamlined shapes.

  4. The lower the speed of an object moving through a fluid, the lesser will be the drag acting on it.

  5. When objects move through fluids, they lose energy in overcoming friction.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. Vehicles are designed to have shapes that reduce fluid friction.

Multiple choice

Which of the following statements is/are false?

a. Friction always opposes motion between the surfaces in contact with each other. b. Drag force acts in a direction opposite to the direction of motion of the object. c. Fluid friction increases the speed of objects moving through the fluids.

  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. Fluid friction reduces the speed of objects moving through the fluids.

Multiple choice

Which of the following statements is/are false?

a. Friction can be reduced, but it can never be made zero. b. A teacher is able to write on the blackboard with a chalk due to friction between the blackboard and the chalk. c. Static friction comes into play when one tries to stop a moving object.

  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. Static friction comes into play when one tries to move a stationary object.

Multiple choice

Which type of motion takes place when a ball on the ground starts rotating as well as moving forward on the ground?

  1. Translatory motion as well as rotatory motion

  2. Circular motion as well as periodic motion

  3. Rectilinear motion as well as rotational motion

  4. Circular motion as well as angular motion

  5. Rectilinear motion as well circular motion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The motion of a ball on the ground: The ball is rolling on the ground – rotating as well as moving forward on the ground. Thus, the ball undergoes rectilinear motion as well as rotational motion.

Multiple choice

Which of the following is a vector quantity?

  1. Momentum

  2. Pressure

  3. Energy

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

Momentum is a vector quantity because it is the product of mass (scalar) and velocity (vector), giving it both magnitude and direction. Pressure, energy, and work are all scalar quantities.

Multiple choice

Which of the following statements is/are false?

(1) Power is the amount of work done in a unit of time and its unit is watt/sec. (2) A force is said to do work when it acts on a body and causes displacement. (3) Energy refers to the capacity to do work.

  1. Only (1)

  2. Only (2)

  3. Only (2) and (3)

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

Statement (1) is incorrect. Power is the amount of work done in a unit of time. Hence, its unit is Watt = J/s.  Statement (2) is correct. Work is always related to the displacement of body in the action of applied force. Statement (3) is correct. ‘Energy’ refers to the capacity to do work.