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 viscosity option b: engineering physics properties of matter physics

Viscous force is somewhat like friction as it opposes, the motion and is non-conservative but not exactly so, because

  1. It is velocity dependent while friction is not

  2. It is velocity independent while friction is not

  3. It is temperature dependent while friction is not

  4. It is independent of area is like surface tension while friction is dependent
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

Using the relation $\tau=\mu\displaystyle\frac{du}{dy}$ we see that viscosity is velocity dependent. Also viscosity decreases with increasing temperature. Thus A and C are correct.

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

The tendency of a body to resist acceleration is called:

  1. Force

  2. Retardation

  3. Inertia

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

Inertia is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. It is the tendency of objects to keep moving in a straight line at constant velocity.

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

The mass of an object is a $\underline{                     }$ measure of inertia:

  1. quantitative

  2. qualitative

  3. absolute

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

The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.

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

The inertia of a moving body makes it:

  1. stop due to friction

  2. increase its speed

  3. decrease its speed

  4. resist a change in its state of motion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Inertia is a physical property that offers resistance to change in the state of motion of an object i.e an object tends to remain in its initial state of motion when no external force is applied to it.

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

The inertial force acts in a 

  1. Opposite direction to that of acceleration force

  2. Same direction as that of accelerating force

  3. Perpendicular direction to that accelerating force

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

The concept of Inertial force is mainly used as a pseudo force in case of accelerating frames of reference.

The inertial force hence will act in a direction opposite to the direction of acceleration of the frame of reference.

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

The mass of object A is 5 kg,that of object B is 40 kg,that of object C is 38 kg,and that of object D is 56 kg. Which object has the greatest inertia?

  1. A

  2. B

  3. C

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

The object having the greatest mass has the greatest inertia because more force is required to change the initial state of the object.

Thus object D has the greatest inertia.

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

A and B are two objects with mass 6 kg and 34 kg respectively. Then,

  1. A has more inertia than B

  2. B has more inertia than A

  3. A and B both have same inertia

  4. None of the above statements is true
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mass of body is translation inertia. So, more mass means more inertia. (heavier body difficult to move)

So, option B is correct.

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

P and Q are two objects with masses 5 kg and 30 kg respectively. Then,

  1. P has more inertia than Q

  2. Q has more inertia than P

  3. P and Q have the same inertia

  4. Neither P nor Q has any inertia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mass is a translation inertia of body.

More mass means more inertia.
So, $ Q$ has more inertia than $P$.
Option B is correct.

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

Passengers standing in a bus are thrown outwards when the bus takes a sudden turn, Because of:

  1. Outward pull on them

  2. Inertia

  3. Change in momentum

  4. Change in acceleration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It’s because of inertia, which is simply the tendency of any body to continue on whatever path it’s travelling unless acted on by an external force. For a standing passenger, his/her body will tend to continue along the straight line route the bus was travelling before the sharp turn. As the passenger’s feet are fairly firmly located to the floor of the bus when it turns, a force will act upon the passenger’s feet accelerating them towards the centre of the turn.