Types Of Forces

Question 1

Newton’s First Law of Motion

Answer 1

A body continues it’s state of rest or uniform motion, provided no net force is acting on it.

Question 2

Newton’s Second Law

Answer 2

Force= mass x acceleration

Question 3

Newton’s Third law of motion

Answer 3

For every action force, there is an equal and opposite reaction force.
~action and reaction acts on two different bodies
~action and reaction are always same nature of forces

Question 4

Friction

Answer 4

A force that opposes motion. It is due to it that mechanical energy is converted to heat energy.

Question 5

Terminal velocity

Answer 5

An object is falling under terminal velocity when it’s weight is equal to the air resistance acting against it

Question 6

Hooke’s law

Answer 6

the load acting on an object is directly proportional to its extension within the elastic limit
F=kx

Question 7

Spring constant (nature/stiffness)

Answer 7

k= F/x

Question 8

Parallel combination

Answer 8

F=Kex

Question 9

Series combination

Answer 9

F=Kex.

x= F/Ke. 1/Ke= 1/K1+1/K2

Question 10

Limit of proportionality

Answer 10

The part up to which the load and the extension remain directly proportional to each other (straight line)

Question 11

Centripetal force

Answer 11

The force and acceleration on a body doing a circular motion always acts towards the centre of the circle
Fc=mv squared/ radius

Question 12

Centre of mass

Answer 12

The point where the body is balanced or the point where the whole weight of the body appears to act vertically down

Question 13

Moment of force

Answer 13

The turning effect of a force
Moment= Force x |distance

The greater the perpendicular distance, the lesser force is applied; the easier the object rotates of the pivot.

Question 14

Principle of moments/law of conservation of moments

Answer 14

A body is balanced (does not rotate) if all the clockwise moments acting on the body is equal to all the anti-clockwise moments acting on it.
Clockwise moments= anti-clockwise moments