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 due to rolling, static and sliding friction in the increasing order is

  1. sliding, static and rolling

  2. rolling, static and sliding

  3. static, sliding and rolling

  4. rolling, sliding and static

  5. static, rolling and sliding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rolling friction is less than sliding friction and sliding friction is less than and static friction, so less force is needed in rolling friction than sliding friction, and much more force is needed in static friction.

Multiple choice

Spring balance measures the

  1. mass of the body

  2. weight of the body

  3. direction of force applied on a body

  4. direction of motion of a moving body

  5. length of the body
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A spring balance is used to measure the weight of the body, because the weight is the force with which a body gets attracted towards the centre of the earth.

Multiple choice

Frictional force always opposes the motion of one object over another object. On which of the following factors does the friction between two surfaces depend?

a. The amount of surface area of the two objects that is in contact with each other b. Smoothness or roughness of the two surfaces c. The force with which the two surfaces are pressed together

  1. Only a

  2. Only b

  3. Only a and b

  4. Only b and c

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

This is the correct option. The friction between two surfaces depends on the smoothness or roughness of the two surfaces and the force with which the two surfaces are pressed together.

Multiple choice

Arrange the following types of forces in increasing order of their magnitudes:

a. Sliding friction b. Rolling friction c. Static friction

  1. Static friction, rolling friction, sliding friction

  2. Sliding friction, static friction, rolling friction

  3. Rolling friction, sliding friction, static friction

  4. Static friction, sliding friction, rolling friction

  5. Rolling friction, static friction, sliding friction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. Rolling friction is much less than sliding friction. Sliding friction is less than static friction. Thus, the correct increasing order of the forces will be: Rolling friction, sliding friction, static friction.

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.