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Chapter 7 : Conservation of Energy, Problem Solving Using Conservation of…
Chapter 7 : Conservation of Energy
Gravitational Potential Energy & Escape Velocity
Law of Conservation of Energy
Energy can be transformed, total amount remains constant
ΔK + ΔU + [change in all other forms of energy] = 0
Mechanical Energy & Its Conservation
No Nonconservative forces : E=K+U=0
K= -U
Principle of Conservation
Work done by conservative force > total energy stays constant
Potential Energy
Conservative & Nonconservative Force
Conservative
-Work done in closed path =0
-Gravitational force
-Elastic force
-Electric force
Nonconservative
-Work done depends on path taken
-Friction
-Tension force
-Air Resistence
Power
(must be constant velocity)
Potential Energy Diagrams ; Stable & Unstable Equilibrium
Behaviour will be determined by total energy
Point C (Stable equilibrium)
Point B (Unstable Equilibrium)
Problem Solving Using Conservation of Mechanical Energy
Which to use for solving problems
Newton's law
: best when forces are constant
Work and energy
: good when forces are constant ; may succed when forces are not constant
Energy Conservation with Dissipative Forces ; Solving Problems
Draw a picture
Determine the system for which energy will be conserved.
Figure out what you looking for, and decide on the initial and final positions.
Choose a logical reference frame.
Apply conservation of energy.
Solve.
TAN LIAN YIN ( A20SC0397 )
