Calculations
Calculating Efficiency
E out
Efficiency=
100
E
Ek
Efficiency= 100
Eg
Kinetic Energy
1
Ek = mv 2
2
k = 1/2mv^2
V2^2 = v1^2 +2a^d
Mechanical Energy
Et = Eg+Ek
Et = mg^h+1/2mv^2
Work
Wnc = E
Kinetic Energy
LEARNING GOAL
The student will be able to explain the concept of kinetic energy.
ENERGY
Energy The ability to do work
Forms of energy:
Thermal
Light
Sound
MECHANICAL ENERGY
Nuclear
Waves in Two Dimensions
Waves are drawn using:
Wavefront line connecting the crests of a wave; since the distance between
successive crests is a wavelength, the distance between wavefronts is also a
w
Gravitational Potential Energy
Learning Goal
The student will be able to explain the concept of gravitational potential energy.
Potential Energy
Potential Energy Energy that is stored in an object due
PHYSICS FORMULAE
v=
d
t
dinitial
t
v=
v AV =
v 2=v 1 + t
v 2 =v 1 +2 a d
1
d =v 2 t a t 2
2
d=
2
2
d x=
v 1 sin 2
g
v1 + v2
2
v
t
1
2
d =v 1 t+ a t
2
2
(v 1 +v 2 )
t
2
F g=mg
a=
t=
F=
2 v 1 sin
Kinetic Energy
LEARNING GOAL
The student will be able to explain the concept of kinetic energy.
ENERGY
Energy The ability to do work
Forms of energy:
Thermal
Light
Sound
Nuclear
Elastic
Kinetic
Conservation of Mechanical Energy
Learning Goal
The student will be able to explain energy transformations using the law of conservation of energy and
solve related problems.
Law of Conservation of En
Conservation of Energy: Part II
Energy is neither created nor destroyed but may be transferred or converted into other forms.
Mechanical energy is conserved only if non-conservative forces do not do w
Power
Power The rate of doing work or transforming energy; or the rate at which energy is supplied.
Ex: Jet engines require an incredible amount of power to do a lot of work in a very short time perio