Introduction to forces
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(New page: ==Newton's First Law== A particle will move with a constant velocity or remain at rest if the resultant force on the particle is zero. '''Equilibrium''' If the resultant force on a par...)
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Revision as of 14:32, 13 March 2009
Newton's First Law
A particle will move with a constant velocity or remain at rest if the resultant force on the particle is zero.
Equilibrium
If the resultant force on a particle is zero, then the forces acting on the particle are said to be in equilibrium.
The Universal Law of Gravitation
\displaystyle F=\frac{Gm_{1}m_{2}}{d^{2}}
\displaystyle G=6.67\times 10^{-11}\text{ kg}^{\text{-1}}\text{m}^{\text{3}}\text{s}^{\text{-2}}
Gravity on Earth
The force of gravity is often called the weight.
\displaystyle \begin{align}
& F=mg \\
& g=9.8\text{ ms}^{\text{-2}} \\
\end{align}
Data
Radius of Earth is
\displaystyle \text{6}.\text{37}\times \text{1}0^{\text{6}}\text{ }
metres
Mass of Earth is \displaystyle \text{5}.\text{98}\times \text{1}0^{\text{24}}\text{ } kg
