Edexcel IGCSE Physics · Spec 8.1
Orbital Speed: Using the Equation
Worked examples using the orbital speed equation.
Physics revision video
Orbital Speed: Using the Equation
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Spec 8.1
What you need to know
- Use v equals two pi r over T
- Rearrange it to find the radius or the period
- Keep the units consistent
Active recall
Quick check
Answer each question before opening the answer.
What is the equation for orbital speed?
Orbital speed = (2 × π × orbital radius) ÷ time period (v = 2πr ÷ T).
What two quantities do you need to calculate orbital speed?
The orbital radius and the time period of the orbit.
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