Question

The 3rd floor of a house is 8 m above street level. How much work is needed to move a 150 kg refrigerator to the 3rd floor?

Answer 1

Work = Force * Displacement

let the up direction be positive y...

Work = 150kg(10m/s^2) * 8m

Work = 12,000 J

Answer 2

Okay, Thank you ^^

Answer 3

work is done by us against gravity

Answer 4

Salini, that's not necessarily true. If you are in space, and move an object in a direction, you have done work. The force in this example came from the acceleration you gave the object, not gravity.