Acceleration Due to gravity

[mattmate]

I need to prove the folowing statement. Can someone please help me as i am having trouble working out the formula needed to determine a value for acceleration. (This has to be proved as simply as possible, using things easily measured, ie Mass, time etc...

Please help as soon as possible,
Thanx
matt

[Integral]

Gravitational force is given by


F= \frac {GM_em} {r^2}

Where
M_e= the mass of the earth
m= the mass of some object
r= radius of the earth
G= The Gravitational constant.


Newtons law

F= ma

Use these two relationships to get an expression for the acceleration due to gravity.

I am guessing that this is what you are asking for. Your question statement leaves a lot to be desired. It simply is not clear what you are asking.

[mattmate]

The question i need to answer is:
"Gather infomation using a wide variety of sources and carry out a simple first hand investigation to determine a value for acceleration due to gravity. Present this by:
1)Including labeled diagram
2)Showing a sample of simple calculations used
3)Identifying Independant, Dependant and constant variables"

The experiment i chose to perform is to drop a small ball froma height of 2meters. I time this, and then i was hoping to be able to answer the above question via this experiment

Thanx
Matt

[Integral]

Please contine in this thread (http://www.physicsforums.com/showthread.php?s=&threadid=9005)

We have a forum for homework help, please use it.