Advanced Science Primary 6 Interactions

Alexa applied some grease to the moving parts of her bicycle. How does this affect the bicycle's performance?

A It makes the bicycle more difficult to stop because friction is increased.
B It increases the gravitational pull on the bicycle.
C It reduces the friction and makes it easier to pedal.
D It increases the friction and makes the bicycle go faster.
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Worked Solution

Step 1: Grease acts as a lubricant. Step [2-9]: Lubricants reduce the frictional force between moving surfaces. Step [2-9]: Less friction means less effort is required to move the parts, making pedalling easier.

Correct answer: It reduces the friction and makes it easier to pedal.

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