5.6 Chapter summary
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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 |
|
|
Velocity |
\(\stackrel{\to }{v}\) |
— |
\(\text{m·s$^{-1}$}\) |
or \(\text{m·s$^{-1}$}\) |
\(\checkmark\) |
|
Force |
\(\stackrel{\to }{F}\) |
— |
\(\text{kg·m·s$^{-2}$}\) |
or \(\text{N}\) |
\(\checkmark\) |
|
Energy |
E |
J |
\(\text{kg·m$^{2}$·s$^{-2}$}\) |
or \(\text{kg·m$^{2}$·s$^{-2}$}\) |
— |
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Work |
W |
J |
\(\text{N·m}\) |
or \(\text{kg·m$^{2}$·s$^{-2}$}\) |
— |
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Kinetic Energy |
\({E}_{K}\) |
J |
\(\text{N·m}\) |
or \(\text{kg·m$^{2}$·s$^{-2}$}\) |
— |
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Potential Energy |
\({E}_{P}\) |
J |
\(\text{N·m}\) |
or \(\text{kg·m$^{2}$·s$^{-2}$}\) |
— |
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Mechanical Energy |
U |
J |
\(\text{N·m}\) |
or \(\text{kg·m$^{2}$·s$^{-2}$}\) |
— |
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Power |
P |
W |
\(\text{N·m·s$^{-1}$}\) |
or \(\text{kg·m$^{2}$·s$^{-3}$}\) |
— |
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Kinetic energy: \({E}_{k}=\frac{1}{2}m{v}^{2}\)
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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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