NEET  >  Flashcards: Work, Energy and Power

# Flashcards: Work, Energy and Power - Notes | Study Physics Class 11 - NEET

``` Page 1

Work, Energy & Power
Flash cards
Page 2

Work, Energy & Power
Flash cards
Work done by a constant force (continued)
Work done by a constant force      during displacement of
point of application of force is
Page 3

Work, Energy & Power
Flash cards
Work done by a constant force (continued)
Work done by a constant force      during displacement of
point of application of force is
Work done by a constant force
W = F
x
(x
2
– x
1
) + F
y
(y
2
– y
1
) + F
z
(z
2
– z
1
)
Where
Page 4

Work, Energy & Power
Flash cards
Work done by a constant force (continued)
Work done by a constant force      during displacement of
point of application of force is
Work done by a constant force
W = F
x
(x
2
– x
1
) + F
y
(y
2
– y
1
) + F
z
(z
2
– z
1
)
Where
The work is said to be positive if the angle between force and
displacement is acute (? < 90 ° ) because
W = = F S cos ? and cos ? = (+)ve
when ? < 90º.
The positive work means that the external force supplies
energy to the system or body.
Page 5

Work, Energy & Power
Flash cards
Work done by a constant force (continued)
Work done by a constant force      during displacement of
point of application of force is
Work done by a constant force
W = F
x
(x
2
– x
1
) + F
y
(y
2
– y
1
) + F
z
(z
2
– z
1
)
Where
The work is said to be positive if the angle between force and
displacement is acute (? < 90 ° ) because
W = = F S cos ? and cos ? = (+)ve
when ? < 90º.
The positive work means that the external force supplies
energy to the system or body.
Negative Work
The work is said to be negative if the angle between force and
displacement is obtuse (? > 90 °) because cos? = (–)ve
when ? > 90 °.
The negative work means that the force is extracting energy
from the system.
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## Physics Class 11

127 videos|464 docs|210 tests

## Physics Class 11

127 videos|464 docs|210 tests

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