A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done? Is this a trick question?
2 answers
no trick. He only moves horizontal, does not work.
Okay, I figured this was the answer. Not to mention, mathematically, the calculation would be
W = (10)(9.8)(cos90)(10)
But, cos90 = 0, so the calculation shows that the man does 0 J of work. If the question had concerned him picking up the sack vertically, then work would have been done. Thank you, I just wanted to check my thinking!
W = (10)(9.8)(cos90)(10)
But, cos90 = 0, so the calculation shows that the man does 0 J of work. If the question had concerned him picking up the sack vertically, then work would have been done. Thank you, I just wanted to check my thinking!
2 answers