Standard Science Primary 4 Matter

Two identical balloons, A and B, were balanced on a lever. Balloon B was then pricked with a needle. What will happen to the lever?

A It will move up and down.
B It will tilt towards B.
C It will remain balanced.
D It will tilt towards A.
Show Worked Solution

Worked Solution

Step 1: Air is matter and has mass. Step 2: Pricking B lets the air escape, making B lighter. Step 3: Balloon A is now heavier than B, causing the lever to tilt towards A.

Correct answer: It will tilt towards A.

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