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

What prevents a car wheel from slipping as it rolls on the ground?

  1. Static friction

  2. Kinetic friction

  3. Coefficient of static friction

  4. Coefficient of kinetic friction

  5. Sliding friction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct. Static friction is the force that prevents a car wheel from slipping as it rolls on the ground. Even though the wheel is in motion, the patch of the tyre in contact with the ground is stationary relative to the ground, so it is static rather than kinetic friction.

Multiple choice

Which of the following statements is incorrect about friction?

  1. It is a force that is created whenever two surfaces move or try to move across each other.

  2. It always opposes the motion or attempted motion of one surface across another surface.

  3. It is dependant on the texture of both surfaces.

  4. It is dependant on the amount of contact force pushing the two surfaces together (normal force).

  5. It increases with the smoothness of surfaces.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Yes, it is an incorrect statement. Friction decreases with the smoothness of surfaces.

Multiple choice

Newton's third law of motion states that, "To every action, there is an equal and oppsite reaction". Which of the following is not an example of Newton's third law of motion?

  1. Recoil of a gun

  2. Motion of a rocket

  3. Receiving a phone call

  4. The rider bends forward when a running horse suddenly stops.

  5. While drawing water, if the strings break up, the man drawing the water falls back.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Newton's third law states that, "For every action, there is an equal and opposite reaction". This is a wrong example.

Multiple choice

Critical damping is the

  1. largest amount of damping for which no oscillation occurs in free vibration

  2. smallest amount of damping for which no oscillation occurs in free vibration

  3. largest amount of damping for which the motion is simple harmonic in free vibration

  4. smallest amount of damping for which the motion is simple harmonic in free vibration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Critical damping is defined as the smallest amount of damping for which no oscillation occurs in free vibration.

Multiple choice

For a Newtonian fluid,

  1. shear stress is proportional to shear strain

  2. rate of shear stress is proportional to shear strain

  3. shear stress is proportional to rate of shear strain

  4. rate of shear stress is proportional to rate of shear strain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Multiple choice

Jump phenomenon in cam and follower system is _______.

  1. None of these

  2. follower looses contact with cam due to excess lubrication

  3. follower looses contact with cam due to damage in follower spring

  4. follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Jump phenomenon occurs in high-speed cam systems when the inertia forces exceed the spring force, causing the follower to lose contact with the cam surface.

Multiple choice

The friction experienced by a body, when in motion, is known as

  1. Rolling Friction

  2. Dynamic Friction

  3. Limiting Friction

  4. Static Friction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Friction experienced by a body in motion is called dynamic or kinetic friction. Static friction occurs when the body is at rest, and limiting friction is the maximum static friction before motion begins.

Multiple choice

The tendency of rotation of the body along any axis is also called ___________

  1. Moment of inertia

  2. Moment of couple

  3. Torque

  4. Force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The tendency of rotation of the body along any axis also called the torque. It is the moment of the force acting perpendicular to the direction of the axis of rotation. If the axis and the force are meeting at any point then there is no moment applied by the force.

Multiple choice

In the simplification of the loading system the net force acts at the ___________ of the loading body.

  1. Centroid

  2. The centre axis

  3. The corner

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

In the simplification of the loading system the net force acts at the centroid of the loading body. That is if the loading system is in the form of the triangle then the at the distance 2 by 3 of the base the net force of the loading will act. And the load will be half the area of the loading.