Why does a visible speck zigzag when the surrounding liquid looks still? Explain Brownian motion as the irregular movement of a suspended particle due to uneven molecular collisions.
Pupils try “Model an uneven series of collisions”. Includes the editable PowerPoint, a 50-minute lesson plan and a printable pupil sheet with equipment, instructions, example evidence and worked teacher answers.
KS3 physics for ages 11–14. Part of the the particle model sequence.
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