Edexcel IGCSE Physics · Spec 4.6-4.7
KE & GPE: Using the Equations
Worked examples using the kinetic and gravitational potential energy equations.
Physics revision video
KE & GPE: Using the Equations
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Spec 4.6-4.7
What you need to know
- Use kinetic energy equals a half m v squared
- Use gravitational potential energy equals m g h
- Combine them for falling objects
Active recall
Quick check
Answer each question before opening the answer.
What is the kinetic energy of a 2 kg mass moving at 3 m/s?
KE = ½ × 2 × 3² = 9 J.
How much GPE is gained lifting 5 kg by 2 m (g = 10 N/kg)?
GPE = m × g × h = 5 × 10 × 2 = 100 J.
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