Question

Basic Physics question:

If you push an object 4 m horizontally on the table and then pushed it vertically for a distance of 3 m.
What will be the Work done on the object?

Answer 1

I know that W=|F||d|cos Ø
I'm not sure if i will use the total Distance or the displcement
to calculate for work.

Answer 2

*displacement

Answer 3

if i'll use total distance, it will be 7 m
if i'll use the displacement it will be 5 m

which one is the right thing?

Answer 4

Work is being done both pushing the object horizontally 4 m, and then lifting it vertically a distance of 3 m. Each of these two things requires energy input.

Answer 5

so it means I should consider the the total distance which is 7 m?

Answer 6

Me thinks you should break it up into two parts. The amount of force needed for horizontal motion doesn't necessarily mean you'l use the same force in vertical motion.

Answer 7

It might in this problem if the table is frictionless...

Answer 8

hmm..let's assume friction is negligible and the force applied is 3 N for both motions, if i break it into two parts, i still need to calculate for the total work done, which will give me 21 J (same amount of work if i use the total distance by the object)