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I was looking at a situation where a fridge in the back of a truck is just about to tip back due to the truck's acceleration. I am looking at the moment just before it tips. The net torque here is 0 since it is not yet tipping back. I thought I was allowed to pick any axis I wished and so picked the one where both the normal force and static frictional force were, in order to give them a zero moment arm. The reason both those forces are at that corner is that the fridge is just about to tip over and that's where the forces are acting (wrong assumption?)

Unfortunately that seems to leave me with an unphysical statement that

Net torque on fridge = 0 = mg(L/2)

where L/2 is the weight's moment arm.

What did I do wrong?

Unfortunately that seems to leave me with an unphysical statement that

Net torque on fridge = 0 = mg(L/2)

where L/2 is the weight's moment arm.

What did I do wrong?

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