Download 1 Newtonian Mechanics: Energy, Work and Power Candidates

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Newtonian Mechanics: Energy, Work and Power
Candidates should be able to:
a) Show understanding that kinetic energy, potential energy (chemical, gravitational, elastic), light energy,
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thermal energy, electrical energy and nuclear energy are examples of different forms of energy
b) State the Principle of the Conservation of Energy and apply the principle to new situations or to solve related
ati
problems
c) Calculate the efficiency of an energy conversion using the formula:
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c
Efficiency = energy converted to useful output / total energy input (*) (#)
d) State that:
i.
kinetic energy, Ek = ½ mv2 and
ii.
gravitational potential energy, Ep = mgh
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E
(for potential energy changes near the Earth’s surface)
e) Apply the relationships for kinetic energy and potential energy to new situations or to solve related problems
f) Recall and apply the relationship:
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Work Done = Force x Distance moved in the direction of the force,
to new situations or to solve related problems
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g) Recall and apply the relationship:
Power = Work Done / Time taken,
to new situations or to solve related problems
* not in combined Science syllabus
# not in N level Science syllabus
O Level Physics – Energy, Work and Power
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Danyal Education
“A commitment to teach and nurture”
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-
Definitions:
kinetic energy
potential energy
o chemical potential energy
o gravitational potential energy
o elastic potential energy
light energy
thermal energy
electrical energy
nuclear energy

Work Done:
Work done is the product of a force, and the
distance moved by the body, in the direction
of the force.

Power:
Power is the rate of work done, or the rate of
energy conversion

Energy:
Energy is the ability to do work.

Kinetic Energy:
The ability to do work through motion.

Gravitational Potential Energy:
The energy stored in objects when they are
lifted above the Earth’s surface.
on
Give examples of forms of energy.
Contact: 9855 9224
du
c
The Principle of the Conservation of Energy states
that energy cannot be destroyed or created.
It can only be converted from one from to another,
or transferred from one body to another.
The total energy in the system remains constant.
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State the Principle of the Conservation of Energy
Formula to calculate Energy Efficiency:
Da
ny
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E

Efficiency =
Total energy input
Energy converted to useful output

Kinetic Energy = ½ mv2

Gravitational Potential Energy = mgh

Work Done = Force x Distance moved in
direction of force

Power =

Power =
Work Done
Time taken
Force x Distance
Time taken
= Force x
Distance
Time
= Force x Speed
where
O Level Physics – Energy, Work and Power
v: speed or velocity (m/s)
m: mass (kg)
h: height (m)
g: gravitational field strength
(N/kg or m/s2)
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