R-ATPHY-3

Circular motion

• Constant speed (not velocity)
  • Magnitude of velocity is unchanged, but direction continuously changes
  • This is done through a force being applied (centripetal)

$v=\frac{s}{t} = \frac{2\pi r}{T}$, where $T$ represents a revolution (the period)

blah blah blah boring diagrams that make sense

wow guys $a_{c}=\frac{v^{2}}{r}$, $F_{c}=ma_{c}=\frac{mv^{2}}{r}$

this is for circles not general forces

• the force is towards the centre.
• the force is a resultant. it's the net force of other forces (like gravity, normal, friction, tension etc.)
• Hence, we need to do vector addition diagrams and free body diagrams

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