On planet Zorg, a 30 kg barbell can be lifted by only exerting a force of 180N. What is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change if on Earth.

To calculate g, we use the formula F = mg. F is given as 180N, and m is given as 30 kg, therefore:

180N = (30kg) (g)

g = 6 m. s-1.

The motion of this object would be decreased on Earth as more force would be required to lift it. If we assume g is 9.8 m. s-1 on Earth, we can calculate the force required.

F = mg

= (30kg) (9.8 m. s-1)

= 294 N