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

Which of the following has more inertia ___

  1. 5Rp coin and 2Rp coin

  2. 2Rp coin and 3Rp coin

  3. 10Kg iron

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Inertia depends upon the mass of the body. If the mass is more, inertia is more and vice versa. 10kg iron has more mass than 5Rp coin and 2 Rp coin thus its inertia is also more.
So, the correct answer is '10kg iron'.
Multiple choice physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

When a tree with a flexible stem is shaken vigorously,its fruits and leaves fall  own.This phenomenon can be explained by making use of

  1. Newton's first law of motion

  2. Newton's second law of motion

  3. Newton's third law of motion

  4. Law of conservation of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 

There are three types of inertia:
1. Inertia of rest: This is the resistance offered by the body to remain in rest unless an external force is not applied on the body. Eg. : If a carpet is beaten with a stick then the dust particles due to inertia of rest tends to remain in rest while the fibres of carpet becomes in motion.


2. Inertia of direction: This is the resistance offered by the body to change its direction unless an ext. force is not applied on the body. Eg : If a bus takes a turn then passengers sitting in tends to remain in the same direction in which the bus was travelling before.


3. Inertia of motion: The resistance offered by the body to change its uniform motion. Eg : If a bus stops suddenly then the passengers fall forward due to inertia of motion

So when we shake a tree, due to inertia of motion the fruit tries to remain in motion. Due to which it gets detached from the branch and falls.

Multiple choice physics force and newton's laws of motion concept of inertia galileo's law and inertia mass 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 is true
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Inertia has direct dependence on $mass$. More is the mass of the body, more is the inertia.

Since, B has more mass, thus B has more inertia than A. 

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

Inertia has direct dependence on $mass$ of the body. More the mass of the body, more will be its inertia.

Since Q has more mass, thus Q has more inertia than P.

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

Why can dust be removed from a carpet by shaking it, or by beating it with a stick?

  1. Because of inertia of rest

  2. Because of inertia of motion

  3. Because of inertia of direction

  4. Because of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the carpet is shaken or beaten by a stick, then the carpet moves back but the dust remains still due to inertia of rest and hence the dust particles get separated out.

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

Which of the following statement is true when a magician pulls a tablecloth from under a table full of dishes without disturbing the dishes?

  1. Gravity holds the dishes still

  2. The weight of the dishes is reduced

  3. Action-reaction forces are in operation

  4. The dishes have inertia

  5. The dishes have no acceleration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The dishes have the inertia at rest, thus they tend to remain at rest even when the tablecloth is pulled of suddenly from the table and hence the dishes do not get disturbed.

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

Passengers standing in a bus are thrown outwards when the bus takes a sudden turn. This is due to:

  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

Newton's I law of inertia states that an object will change its direction when a force is applied to it. Hence, when a bus takes a sudden turn the passengers are thrown outward. This is due to the inertia of direction.

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

Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? 

  1. Iron ball is faster than rubber ball

  2. Rubber ball is faster than iron ball

  3. Both move at the same speed

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

(a) Inertia is the name for the tendency of an object in motion to remain in motion, or an object at rest to remain at rest, unless acted upon by a force. This concept was quantified in Newton's First Law of Motion. For example when a car is abruptly accelerated, drivers and passengers may feel as though their bodies are moving backward. In reality, inertia is making the body want to stay in place as the car moves forward.

(b) Yes, both the balls will start rolling due to inertia of motion. The train stops due to brakes. But the balls continue to move in the direction of the train. But the balls will not roll with the same speed. Iron ball will move slower than the rubber ball because it is heavier in weight.

Multiple choice physics dynamics - explaining motion concept of inertia galileo's law and inertia mass and inertia

Galilee's law of inertia is another name for newton's (... ) law of motion.

  1. First

  2. Second

  3. Third

  4. Anyone of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Galileo's law of inertia is another name for newton's First law of motion. Newton's first law states that an object will remain at rest or move at a constant speed in a straight line unless it is acted on by an unbalanced force. Inertia comes from mass. Objects with more mass have more inertia.

Multiple choice physics dynamics - explaining motion concept of inertia galileo's law and inertia mass and inertia

What is the other name of Galileo's law of falling bodies?

  1. Law of motion

  2. Newton's first law

  3. Newton's second law

  4. Newton's third law
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Galelio’s hypothesis stated,”A falling body accelerates uniformly: it picks up equal amounts of speed in equal time intervals, so that, if it falls from rest, it is moving twice as fast after two seconds as it was moving after one second, and moving three times as fast after three seconds as it was after one second.”


Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

Centrifugation is a process which involves the application of the :

  1. centripetal force

  2. gravitational force

  3. friction

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

Centrifugation is a process which involves the application of the centripetal force for the sedimentation of heterogeneous mixtures with a centrifuge, and is used in industrial and laboratory settings.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

What forces out the water from fabric in washing machine?

  1. Magnetic force

  2. Frictional force

  3. Force of attraction

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

Centrifugation is a process used to separate or concentrate materials suspended in a liquid medium. When you wash clothes in a washing machine, it is the centrifugal force generated in the "spin" cycle that forces water out of the fabric to facilitate faster drying.

Multiple choice physics free, damped and forced oscillations resonance: examples and uses resonance oscillatory motion

Imagine a child sitting on a swing in a park and the child's mother is pushing the swing from the back. The mother maintains the same tempo as the motion of the swing. If the mother tries to push at a faster tempo, the arc of the swing will:

  1. increase

  2. decrease

  3. remain the same

  4. become zero, i.e., the swing will stop
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As the mother maintains the same tempo as the motion of the swing, it means frequency of mother and the swing is same, there is resonance. When mother tries to push at a faster tempo, frequency of mother changes and resonance is disturbed due to which, the arc of swing (amplitude) decreases.