# Force of Gravity/Friction Question

1. Apr 27, 2010

### studen527

1. The problem statement, all variables and given/known data
Hey, I'm new to the forum. I have taken introductory Physic, but missed the first month of class due to serious personal issues. Anyways here's my question:

Determine the weight of a 50kg object on the surface of the moon(Do not use g=1.63N/kg)

Mm(Moon)=7.4x10 to the power of 22kg

2. Relevant equations
Fg=Mg?

3. The attempt at a solution
Like I said, I am pretty lost, but I've come up with this so far:
Fg=Mg
Fg=(7.4x10 to the power of 22kg)(50kg)
I wouldn't be surprised if I was way off, but I've tried a few formulas and have been way off.

Thanks!

2. Apr 28, 2010

### rock.freak667

While this is correct, you are using your M and g incorrectly.

The weight of an object on a planet, is nothing but the gravitational force of attraction between the mass and the planet.

So how do you find the force of attraction between two masses? (Hint: Newton's law of gravitation)

3. Apr 28, 2010

### pat666

If this is early introductory physics surely thats all the lecturer/teacher wants..