Standard Science Primary 4 Cycles

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

A The side with Balloon Q will go down.
B It will remain balanced.
C The side with Balloon P will go down.
D Both sides will go up.
Show Worked Solution

Worked Solution

Step 1: Air has mass. Step 2: When Balloon P is pricked, the air escapes. Step 3: Balloon P becomes lighter than Balloon Q. Step 4: The heavier side (Q) will tilt downwards.

Correct answer: The side with Balloon Q will go down.

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