Standard Science Primary 6 Energy

A toy car is wound up using a key. When released, the car moves across the floor. Which of the following shows the correct energy conversion?

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

Worked Solution

Step 1: Winding the key stores energy in the internal spring (Elastic Potential Energy). Step 2: Releasing the car causes it to move (Kinetic Energy). Step 3: Friction and movement produce noise (Sound Energy). Step 4: Final Answer: Elastic potential energy → Kinetic energy + Sound energy.

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

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