Question

2. In a car engine, an electrical spark from the spark plug ignites the fuel-air mixture in the piston. The explosion and heat cause the air in the cylinder to expand, pushing the piston down.

Answer 1

First, the electrical spark of the car engine is the initial energy that is electrical energy, then the explosion and heat form the thermal energy, then, it produces sound energy and stills getting thermal energy to finally converts to kinetic energy to move the car. The order is:

$\text{Electrical}\to Thermal\to\text{Sound}\to Thermal\to Kinetic$