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CHAPTER 7 : CONSERVATION OF ENERGY - Coggle Diagram
CHAPTER 7 : CONSERVATION OF ENERGY
7-2 POTENTIAL ENERGY
Stretched
elastic band
(mv1^2) /2 + (kx1^2) /2 = (mv2^2) /2 + (kx2^2) /2
Object at some
height
above the ground
Ugrav = mgy
Wound-
spring
Fs= -kx
7-3- MECHANICAL ENERGY & ITS CONSERVATION
Total mechanical energy :
E = K + U
=(mv^2) /2 + mgy
7-4 PROBLEM SOLVING USING CONSERVATION OF MECHANICAL ENERGY
7-6 ENERGY CONSERVATION WITH DISSIPATIVE FORCES : SOLVING PROBLEMS
Draw.
Determine the system for which energy will be conserved.
Figure out what we looking for & decide on the initial & final positions.
Choose logical reference frame.
Apply conservation of energy.
solve
7-7 GRAVITATIONAL POTENTIAL ENERGY & ESCAPE VELOCIT
Y
F = (-GmMe)r / r^2
W = [(GmMe) / r2] - [ (GmMe) / r1]
U(r) = -(GmMe) /r
Vesc = (2GMe / re)^1/2
7-8 POWER
Power- rate at which work is done.
P = W / t
Instantaneous power, P = dW / dt
Unit power = W
1 hp = 550 ft.ibs/s = 746 W
P = F . v
7-1 CONSERVATIVE & NONCONSERVATIVE FORCES
conservative forces
gravity
nonconservative forces
friction
7-9 POTENTIAL ENERGY DIAGRAMS; STABLE & UNSTABLE EQUILIBRIUM
E1 - The object oscillates between x3 & x2, it is calles as turning point.
E2 - has 4 turning points; an object E0 is in stable equilibrium.
An object at x4 is in ustable equilibrium.
7-5 THE LAW OF CONSERVATION OF ENERGY
The
total energy
is neither
increased nor decreased
in any process.
Energy
can be transformed
from one
form
to another
, and transferred
from one object to another
, but the
total amount
remains
constant
.
