help me with this physics promblem?

Question

neglect the effect of rotation of the earth. suppose the earth suddenly stops attracting objects placed near its surface then????????what will be its effect on a person standing on the surface of the earth. it will
a) fly up b) slip along the surface
c)fly along a tangent to the earth's surface d) remain standing

answer is d) but tell me how?? can it be the right choice

Answer 1

this is a very simple question, just think, before this situation comes, the man exerts mg on the ground and ground gives normal reaction force. suddenly if there were no gravity ie, g=0.
the man exerts no force on the ground and the ground also gives no force on to him and hence he will remain as he was before.
(this is possible only by neglecting the effect of our sun and all other particles, galaxies in the universe.)

if there was rotation of earth, the centrifugal force acts on him along the tangent to the surface where he was standing and hence he will be thrown away along the tangent.

Answer 2

The man would fly off on a tangent except that you must neglect the effect of rotation of the earth and the man will therefore remain standing there because of his inertia. With no gravity and no spin, the man feels no force to start him moving in any direction. A body at rest remains at rest.

Answer 3

Newton's first law of motion

Objects in motion tend to stay in motion, and objects at rest tend to stay at rest unless an outside force acts upon them.

When an object is at rest on the surface of the Earth, gravity and the centrifugal force (from the Earth's rotation) by far the most significant forces at play. Get rid of them and there really isn't any outside force to interfere with your standing

This will last a fraction a of a second before the Earth explodes due to its internal pressure and at the same time ripped apart by the gravitational pull of the sun and moon and the moon is flung like a sling shot into space

Answer 4

F = M g

where:

F = Force
M = Mass of the body
g = Acceeration due to gravity


According to your supposition, g=0, or the earth stops attracting the body. This means Force (F) becomes Zero. Hence there is no force acting on the body.

But, according to Newton's Law of motion, a body remains in state of rest unless acted upon by an external force. Since there is no external force acting on the body, the man standign will remain standing

Answer 5

Your Q is somewhat vague. If I neglect the rotation of the earth, nothing will happen without gravity unless I jump. In that case, I will rise to a point to where the friction from the air (if any is left, which I doubt) stops my ascent. Otherwise, I would continue to rise into space. If the earth were rotating, I would be slung off into space on a tangent. Either way, it wouldn't be fun. What have you been smoking, anyway.

'nuff said?

Answer 6

i will fly up if earth continues to revolve about its poles,
i will not slip along the surface because of friction,
as earth is not rotating i will not fly along a tangent,
i will remain standing because a body at rest will continue to be at rest in the absence of g force. and the effect of weight will not be present.but a condition is that the earth should not rotate or revole.

Answer 7

rotation does not effect the earth's gravity in any way...so the person will remain standing on the earth.

Answer 8

I presume that it would be because there would be no other forces acting on it i.e. The only reason something falls is gravity, the question is stating that there would be no gravity therefore the person would remain in a fixed position because there are no other forces acting upon it to move it

Answer 9

if it lost its gravity then the person will fly away , but if its attraction force to the bodies around earth became weeker it could not b week enought in a way that cant attract a person with a low weight .

Answer 10

if earth will stop attarcting everything then man ould stand still on the earth however if a man will try to jump or run he may have problem coming down to the earth