# Acceleration Due to gravity

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...

Thanx
matt

Staff Emeritus
Gold Member
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.

Last edited:

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

Staff Emeritus