Acceleration on the Moon: How Does Gravity Affect Objects?

[ravsterphysics]

Homework Statement

Homework Equations

F=ma

The Attempt at a Solution

I know it's either B or D

Weight = mg so let's say mass of ball is 11kg and gravity on moon is 6, so weight would be 66N

since acceleration a = F/m and we can say that F=mg

therefore a = mg / m which leaves: a=g

and because on the moon the gravity is less this means acceleration is less...yet this is wrong and the answer is D??

 

[Janus]

You calculated the acceleration due to gravity, not the acceleration of the ball due to the force of the spring. One acts downward and the other upward.

 

[ravsterphysics]

You calculated the acceleration due to gravity, not the acceleration of the ball due to the force of the spring. One acts downward and the other upward.

Yep, I completely glossed over that, thanks.

Intuitively it makes sense now, but is there a formula I can use to get a better understanding?

 

[jbriggs444]

Yep, I completely glossed over that, thanks.

Intuitively it makes sense now, but is there a formula I can use to get a better understanding?

∑F = ma