Standard Science Primary 6 Interactions

Ravi wants to reduce the friction between his bicycle chain and the gears. What should he do?

A Replace the chain with a thicker one
B Add oil or grease to the chain
C Wash the chain with water
D Rough up the surface of the gears
Show Worked Solution

Worked Solution

Step 1: Friction occurs when surfaces rub against each other. Step [2-9]: Lubricants like oil or grease create a smooth layer between surfaces. Step [2-9]: This reduces direct contact and friction.

Correct answer: Add oil or grease to the chain

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