Gravitational Force Problem

1. Sep 30, 2008

fewill

1. In tests on earth a lunar surface exploration vehicle (mass = 5.68 × 103 kg) achieves a forward acceleration of 0.220 m/s2. To achieve this same acceleration on the moon, the vehicle's engines must produce a drive force of 1.42 × 103 N. What is the magnitude of the frictional force that acts on the vehicle on the moon?
G= 6.673*10-11
mEarth= 5.98*1024
mMoon= 7.35*1022
rEarth= 6.38*106
rMoon= 1.74*106

2. F=Gm1m2/r2

3. All I know is that the mass is the same on earth as it is on the moon. I figured that the frictional force is the opposite of the driving force. I am lost. Please help.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Sep 30, 2008

Hootenanny

Staff Emeritus

I'll give you a hint: this question has nothing to do with Newton's law of gravitation, but everything to do with Newton's Second Law

3. Sep 30, 2008

fewill

So do I use F-fk=ma?

4. Sep 30, 2008

Hootenanny

Staff Emeritus
Sounds good to me

5. Sep 30, 2008

fewill

Got it thanks!

6. Sep 30, 2008

Hootenanny

Staff Emeritus
A pleasure.