5.6 Chapter summary
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5.5 Power
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5.6 Chapter summary (ESCMK)
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Units |
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Quantity |
Symbol |
Unit |
S.I. Units |
Direction |
|
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Velocity |
→v |
— |
m·s−1 |
or m·s−1 |
✓ |
|
Force |
→F |
— |
kg·m·s−2 |
or N |
✓ |
|
Energy |
E |
J |
kg·m2·s−2 |
or kg·m2·s−2 |
— |
|
Work |
W |
J |
N·m |
or kg·m2·s−2 |
— |
|
Kinetic Energy |
EK |
J |
N·m |
or kg·m2·s−2 |
— |
|
Potential Energy |
EP |
J |
N·m |
or kg·m2·s−2 |
— |
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Mechanical Energy |
U |
J |
N·m |
or kg·m2·s−2 |
— |
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Power |
P |
W |
N·m·s−1 |
or kg·m2·s−3 |
— |
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Kinetic energy: Ek=12mv2
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Conservation of Energy: Energy is never created nor destroyed, but is only transformed from one form to another.
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Conservation of Mechanical Energy: in the absence of non-conservative forces mechanical energy is conserved.
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When a force acting on an object has a component along the line of motion, work is done.
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Work is the process of transferring energy from object or system to another.
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Energy is the ability to do work.
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5.5 Power
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End of chapter exercises
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