Energy Conservation Links
IGCSE Edexcel Physics
4.3, 4.15 Energy Conservation
Key Concepts:
Energy transfers between stores but total energy stays the same.
Section A: Scenarios
1. A ball is dropped from a height. Describe the changes in energy stores as it falls.
[3]
2. A toy car rolls down a ramp and stops. Describe the energy transfers.
[3]
Section B: Calculation
3. A 1.5 kg object is lifted 2 m. Calculate GPE and state what it could become if the object falls.
[3]
Total marks: 9
Mark Scheme
1.
GPE decreases, KE increases; total conserved [3]
2.
GPE to KE; then to thermal/sound due to friction [3]
3.
$GPE = mgh = 1.5 \times 9.8 \times 2 = 29.4\,J$; becomes KE [3]