Summary Work, Energy Power Physical Science Grade 12
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Course
Physical Sciences
Institution
12th Grade
These notes are provide detailed information on the work, energy and power chapter in the Mind Action Series Physical Science Grade 12 textbook. These notes are colourful, have diagrams for further explanation and are very easily understood.
Chapter 5
{ work } (Gravitational) Potential
energy
Definition:
o the product of the Definition:
displacement and the o the energy an object
component of the force possesses due to its position
parallel to the displacement relative to a reference point
o Scalar quantity
p = mgh
o Measured in Joules (J)
o 1J = 1Nm o Ep = potential energy (J)
o M = mass (kg)
W = FΔxcosθ
o G = grav acc (9.8 m.s-2)
+ work → θ = 0 (cos0 = 1)
o H = height above zero level (m)
- Work → θ = 180 (cos180 = -1)
No work → θ = 90 (cos90 = 0) Kinetic energy
WORK ON A SLOPE Definition:
o the energy an object has as a
app
result of the object's motion
F app k = ½mv2
o Ek = kinetic energy (J)
o M = mass (kg)
o V2 = velocity (m.s-1)
Fg⊥ = 0 (bcz at 90 to W) Law of conservation of
Fg// = mgsinθ mechanical energy
WFapp = FappΔxcosθ (cos0) Definition:
WFfric = FfricΔxcosθ (cos180) o the total energy in a system
cannot be created nor
WFg// = mgsinβΔxcosθ destroyed; only transformed
Wnet = Wfapp + Wffric + Wfg// from one form to another
{ energy } o In absence of air resistance or
external forces, Em of object = k
o Scalar quantity
(Ep + Ek)i = (Ep + Ek)f
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