Question

SECTION-C
05. (1) A body has a mass 2 kg and a certain weight. Mass remains the same when weighed at
equator but weight decreases. Why?
2.
(2) Differentiate between mass and weight. Write any 3 differences.
3
Q6. Define inertia. List its type. Give one example to describe each type. please I am giving 50 pts​

Answer 1

Answer:

1. A mass of any body doesnot change anywhere but weight is dependent on the gravitational force. As the earth as a spherical shape and flattened at poles , the gravitational force changes and also the weight changes

2. (i) Mass is constant at any place whereas weight changes place to place

   (ii) Si unit of mass=kg      Si unit of weight= N

    (iii) mass is denoted by 'M'      weight is denoted by 'W'

3.Inertia is the tendancy to remain unchanged.there are three types:

 (i) inertia of rest :  property of a body by virtue of which it cannot change its position of rest.

 (ii) inertia of motion: property of a body by virtue of which it cannot change its position of motion

  (iii) inertia of direction:An object will stay moving in the same direction unless a force acts on it.

PLEASE FOLLOW AND MARK AS BRAINLIEST

Answer 2

If we start thinking from atomic structure point of view of materials, we know that every material is composed of molecules which comprises atoms.

now, on the basis of nature and size of molecule and how tightly atoms are packed in molecule, the idea of mass come into play.

If atoms are more tightly packed the element tends to be heavier.

If we think from physics point of view, mass represents inertia i.e. the tendency to oppose a force. mass is the characteristics of nature and size of matter.

If we need greater force to change the status of an object, the greater is the mass. Naturally, an object, if at rest, wants to remain at rest or if in motion, wants to remain in motion. To change the status we need to apply force. thus, we can classify inertia as

inertia of rest

inertia of motion

inertia of direction

now you may ask why third one!!!

because, even if we don't change the speed of a moving object, still we need force to change its direction only.

since, it is characteristics of matter, it remains same everywhere whether we measure the mass on equator or moon.

now weight

weight is the force with which the earth (or moon) pulls the body towards its centre.

the weight of a body is given by

W = mg

where m is mass of the body (which does not change)

g is the acceleration due to gravity

so do I want to say that it is g which changes place to place!!!!

exactly, this is what I want to say

the acceleration due to gravity g is given by

g = GM/R^2

here, G is universal gravitational constant. It is supposed to be same everywhere ( that is why the name constant is attached to it)

M is the mass which is pulling the body towards its centre. here M is mass of earth. (ofcourse being mass, it is also constant for places near eaeth, but not on moon)

R is the radius of earth ( now you would say that it is also constant)

NO, earth is not spherical so R is not same everywhere on earch. R is more on equator as compared with pole.

since R is more on equator

1/R^2 will be less on equator

g will be less on equator

weight will be less on equator.

hope I was clear enough