HOTS Science Primary 6 Interactions

Stan conducted an experiment to see how the angle of a ramp affects the distance a wooden block slides. He noticed that at 15°, the block did not move at all. Why?

A The frictional force was equal to the pulling force of gravity down the slope.
B The block had too much potential energy.
C The ramp surface became smoother at a lower angle.
D There was no gravitational force acting on the block.
Show Worked Solution

Worked Solution

Step 1: Analyze why an object remains stationary on a slope. Step 2: Gravity pulls the block down the slope. Step 3: Friction between the block and ramp opposes this movement. Step 4: If the forces are balanced, the block will not move.

Correct answer: The frictional force was equal to the pulling force of gravity down the slope.

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