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Physics
Work and Energy
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Created by
Serena Singh
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Cards (13)
Work
requires
energy
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Work
is
done
when a
force
produces
motion
in a
body
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Conditions for work to be done:
Force
should be
applied
on the
body
Body
should be
displaced
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Work done in moving a body =
Force
×
Displacement
Work is a
scalar
quantity
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Unit of work is
Newton meter
or
Joule
1
Joule = 1
Newton
×
1 meter
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Factors affecting the amount of work done:
Magnitude of force
Displacement
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Work done by a force can be
positive
,
negative
, or
zero
Positive
work: force acts in the direction of motion
Negative
work: force acts opposite to the direction of motion
Zero
work: force acts at right angles to the direction of motion
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Energy
is the
capacity
of doing
work
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Energy is a
scalar
quantity
SI unit of
energy
is
Joule
(
J
)
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Mechanical
energy is the sum of
kinetic
energy and
potential
energy of a body
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Kinetic energy
is the energy of a body due to its
motion
Kinetic energy
is
directly proportional
to
mass
and the
square
of
velocity
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Potential energy
is the
energy
of a body due to its
position
or
change
in
shape
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Unit of power:
SI unit of power is
Watt
(
W
) =
1 Joule
/
second
1 Watt
(W) =
1 Joule
/
1 second
=
1 J
/
1
s
Average power = Total work done or total energy used / Total time taken
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