Standard Science Primary 6 Interactions

Siti released a wooden block from the top of a ramp. She noticed the block moved more slowly on Surface Y compared to Surface X. Which of the following is the most likely reason?

A Surface Y is steeper than Surface X.
B Surface Y is smoother than Surface X.
C The block has more gravitational potential energy on Surface Y.
D Surface Y exerts more frictional force on the block.
Show Worked Solution

Worked Solution

Step 1: Identify that the block moved slower on Surface Y. Step 2: Slower movement indicates a greater force opposing motion. Step 3: Friction is the force that opposes motion between two surfaces. Step 4: Therefore, Surface Y must exert more frictional force.

Correct answer: Surface Y exerts more frictional force on the block.

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