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Work Power Energy

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40 views49 pages

Work Power Energy

Uploaded by

gacutanirish7
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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General Physics

1
WORK,
POWER,ENERGY
Nelson A. Tubban Jr.
Teacher II
WORK
Work????
Work????
Work????
Work????
General Physics
1
WORK,
POWER,ENERGY
Nelson A. Tubban Jr.
Teacher II
POWER
• expressible as the amount
of work done W, or energy
transferred, divided by
the time interval t—or
W/t
Power
• WORK= Nm/Joule
• Time= Seconds
• POWER= Watt or 1 J/s
• P= W or f x d
t t
Sample Problem
1 worker raises
• A construction
a 45.3 kg crate from the
ground to a shelf at a height
of 1.52 m. If the process
took 22.40 s, what was the
power the lift exerted on
the crate?
GIVEN
• m= 45.3 kg
• d= 1.52 m
• g= 9.8 m/s2
• t= 22.40 s
• Unknown : P= ?
FORMULA:P= W or f x d
t t
SOLUTION
W= m x g
(45.3 kg x 9.8 m/s2)
= 443.94 N- Force
W=f x d
(443.94 N)(1.52m)
= 674.79 J
SOLUTION
P= W
t
= 674.79 J
22.40 s
= 30.12 Watt or J/s
Sample Problem
3 a 15.453 kg
• A worker raises
crate from the ground to a
shelf at a height of 7.36 m.
If the process took 27.41 s,
what was the power the lift
exerted on the crate?
• A mass of 857.4 kg is lifted
a distance of 85.17 m.
Calculate the potential
energy
• A mass of 14.98 kg is lifted
a distance of 85.337 m.
Calculate the potential
energy

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