Final answer:
Materials for tires, brakes, and pistons in cars are selected based on factors such as friction, heat resistance, and strength.
Explanation:
Tires: Scientists determine the best materials for tires based on the concept of friction. Tires need to have good grip on the road to ensure traction and prevent slipping, so materials like rubber with tread patterns are used to maximize friction.
Brakes: For brakes, scientists consider materials that can handle high temperatures and create enough friction to stop the car efficiently. Brake pads are often made of composite materials like ceramics and metals to withstand heat and provide the necessary friction.
Pistons (moving parts within the engine): When selecting materials for pistons, scientists look for ones with high strength, heat resistance, and low expansion rates. Materials like aluminum alloys are commonly used for pistons due to these properties, allowing them to withstand the high temperatures and pressures within the engine.
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