Standard Science Primary 6 Interactions

Siti observed that it was harder to push a heavy crate across a concrete floor than across a tiled floor. Which of the following best explains her observation?

A The concrete floor is smoother than the tiled floor.
B The concrete floor exerts more frictional force on the crate.
C The crate has more mass when it is on the concrete floor.
D The tiled floor exerts more frictional force on the crate.
Show Worked Solution

Worked Solution

Step 1: Identify that the difficulty in pushing is due to the force opposing motion (friction). Step 2: Friction depends on the roughness of the surfaces in contact. Step 3: Concrete is rougher than tiles, thus exerting more frictional force.

Correct answer: The concrete floor exerts more frictional force on the crate.

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