General Knowledge - Basic General Knowledge - Discussion

Please explain the reason.

What's the reason?

Gravity is relative to the reference frame. Einstein proved that acceleration and gravity are indistinguishable. If the reference frame is accelerating toward Earth's axis, then centrifugal acceleration of the reference frame partly cancels the gravitational attraction of Earth's mass.

It is ridiculous to make impossible assumptions; Earth's rotation will not increase significantly in less than a million years. However, at the equator, you weigh slightly more on a westbound train than on an eastbound train. In a sidereal reference frame centered on Earth but not rotating with Earth, your weight doesn't change.

Source:

http://in.answers.yahoo.com/question/index?qid=20100629102422AABWDeF

Hi every1,

I think in this case the question is about what effect will increased rotation have on the body on the surface of the earth.

The solution can be understood in a very simple example, if we are traveling in a car and it takes a left turn, we are pushed towards right, here the force acting is the centrifugal force which pushes the body outwards.

Similarly for a body on the surface of the earth, if the earth's rotation increases the centrifugal force will be acting on each body to throw it outward, but due to gravity it will not be thrown off.

And weight=mass* g(acc. due to gravity)

but in this case,

weight= mass* (g - the centrifugal force)

Hence the weight of the body would decrease when rotation increases..

Do let me know if any thing else is required in this regard.

Excellent !

Excellent Explanation Akshay..!

Good Explanation.

I have some doubt in Akshay's answer. If centrifugal force trying to pull the body outside then the centrifugal force on the body increases. Then why don't we add centrifugal force to the weight. And why do we need to add centrifugal force to weight.

Weight=m*g (in general case).

Now as the earth rotates with more speed it is likely to produce more centrifugal force as per mv^2/r as we (velocity) will increase as stated. Are (radius of earth) remains constant.

Now centrifugal force tries to cancel out the gravity force (basic concept). The increase in centrifugal force will try to decrease weight of body which is essentially nothing but gravity's effect on mass.

If you observe the same principle is used in satellites, as they rotate with certain speed they come under earth's gravitation field or in other words they cancel out gravitation force which is trying to bring satellite on the earth.

Weight shuold remain constant. Because being in inertial frame. No effect on body's weight should take place.