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# Earth vs Moon

Lets say we moved upwards a little bit in a parachute, then after 12 hours, due to Earth's rotation, we must be above US? (Considering initially we were in India) Answer is clearly NO. Thats because of Earth's atmosphere. It applies force on us and make us move with Earth.

Consider 2nd situation. We are now at moon. No atmosphere! So now can we move just by the above mentioned way?

Note by Pranjal Jain
2 years, 5 months ago

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Comment deleted Jan 31, 2015

Gravity is acting downwards! How will it provide acceleration towards rotation of earth? · 2 years, 5 months ago

Sorry. I am wrong. I am deleting my comment. · 2 years, 5 months ago

It's not the earth's atmosphere that's exerting force on us. Actually we are not at rest we are already having an angular velocity which is same as that of earth which will keep us above the same place from where we made the jump.

@Pranjal Jain · 2 years, 5 months ago

Your is the correct explanation. Thanks. I am deleting mine. · 2 years, 5 months ago

How was your INChO btw? · 2 years, 5 months ago

Bad , had to leave the last question. Very Very slim chances of getting selected. · 2 years, 5 months ago

0 here. Some chances in astronomy. · 2 years, 5 months ago

I agree we have that angular velocity. But once we rise up in a parachute, Earth will continue with its rotation, but we won't. · 2 years, 5 months ago

Have you forgot conservation of angular momemtum. · 2 years, 5 months ago

Say parachute has some mechanism to stop that angular velocity. · 2 years, 5 months ago

Okay then it will clearly land on U.S in 12 hours · 2 years, 5 months ago

Are you sure? We just have used it to stop our angular velocity, no extra force!! Don't you think atmosphere will exert force? I think there's no need of airplanes if you can move around the world in 1 day. Energy is required just for anti-gravity. · 2 years, 5 months ago

Yep I am sure the atmosphere will exert pressure due to air drag and it will regain it's angular velocity after some time . I thought you said that there is a mechanism for parachute to keep it's angular velocity to a halt. · 2 years, 5 months ago

So now would this mechanism work on moon? · 2 years, 5 months ago

Yep sure but it must take huge engines for stopping it's angular velocity.

Also if one would be standing on moon he would only see parachute behave like an aeroplane and he would be unable to appreciate the fact that the parachute just hovered over the moon and reached the other side. The person standing on the moon will see the parachute starting it's engines gaining speed and travelling to the other side of the moon as normal aeroplanes do on earth.

@Pranjal Jain · 2 years, 5 months ago