PHYSICS DEFINITION:
Joule: Work done when a force of 1N moves a distance
of 1 m in the direction of the force.
Principle of Conservation of Energy: Energy cannot be
created or destroyed. It can only be changed from one form to another.
Power: Power of a device is the rate at which it does
work per unit of time.
Watt: 1 W is 1 J per second.
PHYSICS KEYWORD LIST:
Energy: Calculated quantity that is conserved during
any change; that which is transferred when a force does work.
Gravitational Potential Energy (GPE): Energy a body
has due to its position in a gravitational field.
PHYSICS CHAPTER WISE SUMMARY:
The work done W when a force F moves through a displacement
s in the direction of the force:
W = Fs or W = Fs Cos angle (angle between force and
displacement)
A joule is defined as the work done (or energy transferred)
when a force of 1N moves a distance of 1 m in the direction of the force.
When an object of mass m rises through a height h, its
gravitational potential energy increases by an amount: GPE = mgh.
The kinetic energy of a body of mass m moving at speed v is:
KE = ½ mv^2.
The principle of conservation of energy states that, for a
closed system, energy can be transferred to other forms but the total amount of
energy remains constant.
The efficiency of a device or system is determined using the
equation: Efficiency = (Useful output energy / Total input energy) x 100%.
Power is the rate at which work is done (or energy
transferred): P = W/t and P = Fv.
A watt is defined as a rate of transfer of energy 1 J per
second.
PHYSICS IMPORTANT NOTES:
Work done = force x distance (W = Fd)
Work done = energy transferred
1 Joule = 1N x 1 m = 1 Nm
Work done = Fd Cos angle
GPE = w x h = mgh
Kinetic Energy = 0.5 x mass x speed ^2 (KE = 1/2 mv^2)
Efficiency = (Useful output energy / Total input energy) x
100 %
Power = Work done / Time (P = W/t)
Power = Force x velocity (P = Fs)
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