Taking my Electricity and Magnitism course right now and we are in the section in the book of the electric potential.
I have some basic questions regarding work and potential energy.
Lets say we are holding a ball 10m above the ground and release it. I am defining the ground to be zero.
The ball has all potential and no kinetic energy when it is in my hand at 10m.
If i want to find the potential energy of this system once I drop the ball and it touches the ground is:
ΔU=Uf-Ui, this will give me a negative ΔU, since the final "h" of the ball is 0m and initial "h" of the ball is 10m. I am fine with this.
Now when thinking about the work, work is done on the ball by the force (forge of gravity)
work is defined: W=Fdcosθ, the "d" is displacement.
Why is the displacement not negative? is the displacement ever negative? is a better way to think about this making "d" distance rather than displacement since a distance cannot be negative?
The Attempt at a Solution