HOTS Science Primary 6 Interactions

A block is placed on a ramp. As the ramp is slowly tilted higher, at what point will the block start to slide down?

A When the force of gravity is equal to friction.
B When the mass of the block increases.
C When air resistance is removed.
D When the component of gravity along the slope is greater than friction.
Show Worked Solution

Worked Solution

Step 1: Static friction keeps the block in place. Step [2-9]: As the tilt increases, the downward pull of gravity along the slope increases. Step [2-9]: Once this pull exceeds the maximum static friction, motion begins.

Correct answer: When the component of gravity along the slope is greater than friction.

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