Physics ยท 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

A boy was travelling for the first time in an aeroplane. As the flight took off from the airport, he got an uneasy feeling. He felt that some pressure changes had occurred. What forces were acting on the aeroplane immediately after it took off?

  1. Magnetism and muscular force

  2. Gravity and friction of air

  3. Electrostatic force and magnetism

  4. Magnetism and mechanical force

  5. Friction of fuel and muscular force
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gravity and friction of air were acting on the aeroplane immediately after it took off.

Multiple choice

Which of the following statements about force is false?

  1. At least two objects must interact for a force to take place.

  2. Forces applied on an object in the same direction add to one another.

  3. Force has only magnitude.

  4. If two forces act in opposite directions on an object, the net force acting on it, is the difference between the two forces.

  5. More than one force may act on an object.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The statement is false.

Multiple choice

Which of the following is an example of muscular force?

  1. Magnet attracting an iron piece.

  2. Blacksmith hammering a hot piece of iron.

  3. A rolling ball coming to rest.

  4. An apple falling from a tree.

  5. An aircraft taking off.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blacksmith uses his muscular force to hammer a hot piece of iron.

Multiple choice

In which of the following cases is the maximum friction observed?

  1. A boy doing roller skating.

  2. A ball hits another ball rolling across the billiard's table.

  3. A boy dragging a mat on which another boy is seated.

  4. Holding a greasy tumbler.

  5. Playing carrom on a board that was sprinkled with powder.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The boy dragging the mat has to pull the weight of the other boy seated on it. So, there is more friction on the mat.

Multiple choice

Which of the following is an example of contact force?

  1. Like poles of magnets repelling each other.

  2. Pressing a lump of dough to make chapatti balls.

  3. Straw rubbed with paper attracting another straw, which is not rubbed with paper.

  4. Water flowing down from a tap.

  5. Electromagnets being used to pick up metallic scrap.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressing a lump of dough to make chapatti balls is due to muscular force (contact force).

Multiple choice

Which of the following is not a negative effect of friction?

  1. Worn out soles in an old shoe.

  2. A child is able to write with a pencil.

  3. Ball bearing in a machine wearing out.

  4. Wearing out of tyres of vehicles.

  5. Machine working for a long time producing too much heat.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Writing with a pencil or pen will not be possible without friction.

Multiple choice

Which of the following statements is NOT true?

  1. Without friction a building could be easily constructed.

  2. Writing with pen or pencil could not be possible, if there was no friction.

  3. Friction depends on the nature of surfaces in contact.

  4. Friction is sometimes undesirable.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Construction of building is possible only because of friction.

Multiple choice

Which of the following statements is false?

  1. Friction can slow things down.

  2. Friction is never useful.

  3. Friction depends on the nature of surfaces in contact.

  4. Friction can stop things from moving.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Friction is sometimes useful. It is important for many of our activities like writing with a pen, fixing a nail on the wall, tying a knot, etc.

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.