Standard Science Primary 6 Interactions

Why is oil often added to the moving parts of a bicycle chain?

A To make the chain heavier and more stable
B To increase the speed of the bicycle
C To reduce the wear and tear of the metal parts
D To increase the friction between the gears
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Worked Solution

Step 1: Metal parts rubbing against each other create friction. Step 2: Friction causes heat and wearing down of surfaces. Step 3: Oil acts as a lubricant to reduce friction and protect the parts.

Correct answer: To reduce the wear and tear of the metal parts

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