Infrasonic waves
Can elephants “talk” using sounds humans can’t hear?
Doppler in sound
Why does a passing train whistle sound higher as it approaches and lower as it leaves?
Loudness vs intensity
Why does loud music feel “vibrating” in your chest sometimes?
Musical instruments
Why do guitar and violin produce different sounds even on the same note?
Sonic boom
Why do fighter jets create a loud “boom” when flying fast?
Density
Why do steel ships float when steel sinks?
Buoyancy
Why do we feel lighter while swimming?
Atmospheric pressure
Why don’t we get crushed under the weight of air above us?
Vacuum bottles
Why do thermos flasks keep drinks hot or cold longer?
Surface tension
Why do small insects walk on water?
Capillary action
How do trees lift water up from roots to leaves without pumps?
Ohm’s Law Unplugged
Why does a bulb glow brighter when you increase the voltage?
Resistance in Real Life
Why do thick wires heat less than thin wires?
Series vs Parallel
Two bulbs are connected in series. If one burns out, what happens to the other?
Why Homes Prefer Parallel
Why are household circuits always connected in parallel, not series?
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