Laws of Motion

Question 1

What is force ?

Answer 1

A push or pull which produces or tries to produce motion in a body at rest or in motion or changes or tries to change its direction

Question 2

What are the different types of forces ?

Answer 2

There are four types of forces

1. Gravitational force (WEAKEST FORCE) (due to the mass of the body)
2. Weak force (b/w elementary particles like electrons and antineutrino)
3. Electromagnetic force (due to charge or current)
4. Strong force (STRONGEST FORCE) (bind neutron and proton in a nucleus)

Question 3

Name some electromagnetic forces

Answer 3

Spring force, force of friction, tension, etc. are all electromagnetic forces

Question 4

What are contact forces ?

Answer 4

Forces which are produced due to contact
ex- friction, normal reaction, etc.

> normal reaction forces are always perpendicular to the surface

Question 5

What are field forces?

Answer 5

forces that are caused due to any field (electric or magnetic)

Question 6

What are conservative forces ?

Answer 6

If work done by a force depends initial and final positions of the object and not on the nature of the path followed b/w the initial and final position , then it is called conservative force.

ex- gravitational force, electrostatic force, magnetic force, etc.

> Work done by a conservative force through a round trip is always zero

Question 7

What are non conservative forces ?

Answer 7

if work done by a force depends upon the path followed through the initial and final position, then it is known as non conservative force.

ex- force of friction, viscous force, air resistance, etc.