Wa
,Work
• Work is the transfer of energy from one system to another.
• Energy is transferred by force.
• Common units are JI = [Nm.]
W Fx x
Fx--Force Δx--Displacement
Only the force parallel to the displacement does work.
,Work
• On a graph of force versus displacement, work is the area “under t
curve.”
, W=Fx
Work and Energy - Δ PE =-ΔPE
Fx:-d# a Δx
dx
• Using W = Fxx and Fx = - dU/dx - U/x, we can write
Δ
ΔPE
W U
(PEF-PFi
Which states work is a negative change in potential energy.
,Work
• Work is the transfer of energy from one system to another.
• Energy is transferred by force.
• Common units are JI = [Nm.]
W Fx x
Fx--Force Δx--Displacement
Only the force parallel to the displacement does work.
,Work
• On a graph of force versus displacement, work is the area “under t
curve.”
, W=Fx
Work and Energy - Δ PE =-ΔPE
Fx:-d# a Δx
dx
• Using W = Fxx and Fx = - dU/dx - U/x, we can write
Δ
ΔPE
W U
(PEF-PFi
Which states work is a negative change in potential energy.
