Advanced Science Primary 6 Energy

A toy car is wound up using a key. When released, it moves across the floor and makes a buzzing sound. What is the energy conversion?

A Electrical energy → Kinetic energy
B Elastic potential energy → Kinetic energy + Sound energy
C Gravitational potential energy → Sound energy
D Chemical potential energy → Kinetic energy
Show Worked Solution

Worked Solution

Step 1: Winding the key stretches or compresses a spring, storing elastic potential energy. Step [2-9]: Releasing it turns the wheels (kinetic energy). Step [2-9]: Friction and movement create sound as a byproduct.

Correct answer: Elastic potential energy → Kinetic energy + Sound energy

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