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 physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

The inertia of an object tends to cause the object:

  1. $to\ increase\ its\ speed$
  2. $to\ decrease\ its\ speed$
  3. $to\ resist\ any\ change\ in\ its\ state\ of\ motion$
  4. $to\ decelerate\ due\ to\ friction$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Inertia of an object is the tendency of the object to resist change in  motion. The inertia is directly dependent on the mass of the body. 
Inertia resist any change in its state of motion and is of three types:

  1. Inertia of rest
  2. Inertia of motion
  3. Inertia of direction

Multiple choice physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

A coin tossed vertically by a passenger sitting in a train that is moving with a uniform velocity, still returns to his palm. This demonstrates the principle of.

  1. Inertia(Newton's First Law of Motion)

  2. Conservation of angular momentum

  3. Addition of velocities of the train and the coin

  4. Addition of forces due to gravity and the toss of the coin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A coin tossed vertically by a passenger sitting in a train that is moving with a uniform velocity, still returns to his palm, it happens due to the phenomenon of inertia as the person and coin in his hand both are in uniform motion with the train.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

The periodic vibrations of a body of constant amplitude in the absence of any external force on it are called

  1. Forced vibrations

  2. Free vibration

  3. Damped vibrations

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

Forced vibrations: External force is acting on the body. 
Free vibration: Constant amplitude and no external force.
Damped vibration: Amplitude is not constant, it keeps on decreasing due to environmental factors of the system like air resistance.  
Therefore, correct option is B. 

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

The tendency of one object to force another adjoining or interconnected object into vibration motion is referred to as a 

  1. forced vibration.

  2. damped vibration

  3. loudness

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

The tendency of one object to force another adjoining or interconnected object into vibrating motion is referred to as a forced oscillation.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

If a force is continually or repeatedly applied to keep the oscillation going, it is called 

  1. forced oscillator.

  2. free oscillatior

  3. damped oscillatior

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a periodically repetitive and oscillatory force acts on an object, then the object is forced to oscillate with the frequency of the periodic force. Such oscillation is known as forced oscillation. When an object is displaced from its mean position and allowed to vibrate along its mean position then the object vibrates with its own natural frequency. This is known as free vibration or oscillation. And an oscillation in which the amplitude goes on decreasing with time is known as damped oscillation.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

When we push a child in a swing, the amplitude of the oscillation

  1. decreases

  2. increases

  3. remains same

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

By pushing a child on a swing a driving force is applied which forces the swing and the child in the forward direction. The gravitational force acts as a restoring force and pulls back the child to the original position. These two forces together set them into an oscillatory motion. By pushing the child the amplitude, that is the maximum displacement, increases.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

A motion caused by an unbalanced rotating component is an example of

  1. free vibration

  2. forced vibration

  3. natural vibration

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

A motion of an unbalanced rotating component is an example of forced vibration. As to rotate it with the unbalanced condition some external agent is required.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

The oscillation of a body or system with its own natural frequency and under no external influence other than the impulse that initiated the motion is known as:

  1. Damped oscillation

  2. Free oscillation

  3. Impulsive oscillation

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

The oscillation of a body or system with its own natural frequency and under no external influence other than the impulse that initiated the motion is known as free oscillation.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

The vibrations of a body which take place under the influence of an external periodic force acting on it are called 

  1. Forced vibrations

  2. Free vibration

  3. Damped vibrations

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

Forced vibrations: External force is acting on the body. 
Free vibration: Constant amplitude and no external force.
Damped vibration: Amplitude is not constant, it keeps on decreasing due to environmental factors of the system like air resistance.  
Therefore, correct option is A. 

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

Which of the following is/are correct?

  1. The vibration of drilling machine depends on a force from outside

  2. The vibration of drilling machine does not depend on a force from outside

  3. When a pendulum vibrates it is free vibration because it does not depend on any outside force to vibrate

  4. When a pendulum vibrates it is free vibration because it depends on any outside force to vibrate
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

The correct statements are:

$A$ The vibration of drilling machine depends on the force from outside. Here the driven machine is driven by electricity.
$C$ When a pendulum vibrate it is free vibration because it does not depend upon any outside force to vibrate.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

The oscillations about a systems equilibrium position that occur in the absence of an external excitation are 

  1. free vibrations

  2. damped vibrations

  3. natural vibrations

  4. None of these
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

The oscillations about a system of equilibrium position that occur in the absence of an external excitation are free vibrations or natural vibrations.

Multiple choice free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

The oscillation of a body or system with its own natural frequency and under no external influence other than the impulse that initiated the motion

  1. Damped oscillation

  2. Free oscillation

  3. Impulsive oscillation

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

Force vibration is a type at vibration in which a body is vibrate without any external influence and vibrates with its natural frequency. So, given statement describes a free vibrations.