Advanced Science Primary 6 Interactions

Siti dropped two identical balls from a height. Ball A was dropped through a tube of air, while Ball B was dropped through a tube of water. Which ball will hit the bottom first and why?

A Ball A, because gravity acts more strongly in air.
B Ball A, because air is less dense and exerts less frictional force.
C Ball B, because the surface area of the ball decreases in water.
D Ball B, because water is heavier and pulls the ball down faster.
Show Worked Solution

Worked Solution

Step 1: Both balls experience gravitational pull. Step [2-9]: Friction (resistance) opposes the motion. Step [2-9]: Water is denser than air, exerting more friction (drag), so Ball A hits first.

Correct answer: Ball A, because air is less dense and exerts less frictional force.

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