· disappearing test tubes (showing the effect of similar refractive indices),
· the pop-pop boat (Newton ’s Third law of motion in action and the difference between speed and velocity),
· melting and non-melting ice cubes on blocks of different materials at the same temperature,
· popping a balloon with one nail is easier than with a dozen nails (illustrating pressure = force / area)
· how to make a loudspeaker.
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