Physics: Age 14

14 illustrated Physics lessons for Age 14.

How Water Mist Fights Fire Tiny water droplets soak up a lot of heat from hot smoke as they turn into steam. That steam takes up about 17…
Why a helicopter does not spin When the main rotor spins one way, the helicopter body is pushed to turn the opposite way. A small sideways ta…
Thick air, hot planet A planet's atmosphere lets sunlight in but slows the heat trying to leave, so a thicker atmosphere leaves the …
Measuring the Sea's Depth with an Echo A boat sends a short sound pulse down to the seabed and times how long the echo takes to come back. Since soun…
Same Mass, Different Weight Weight is the force of gravity on an object, found with P = m × g. Because the Moon's gravity is about one six…
Power in a circuit Electrical power is voltage multiplied by current. A device that uses more power transforms electrical energy …
Interactive Water Falls, Power Flows Water held high behind a dam has stored energy. As it falls and spins a turbine, that energy changes form unti…
Cue Ball Spin After Impact Where the cue tip strikes the white cue ball changes how the ball spins. Hitting above center makes it roll fo…
Earth as a Giant Magnet Earth has a magnetic field that spreads through space like the field of a huge bar magnet. A compass needle tu…
Tiny Center in a Vast Arena An atom has a tiny, dense center called the nucleus. Its electrons are much farther away, so most of the atom …
Tsunami from Deep to Shallow In the deep ocean, a tsunami wave moves fast but stays low and stretched out. As it reaches shallow coastal wa…
Arc of Colored Bands A rainbow separates white sunlight into colored bands. The bands always run from red on the outside edge to vi…
Two Skydivers, Two Top Speeds As a skydiver speeds up, air pushes up harder until that push equals their weight, and then their speed stops …
Field Lines Tilt at Every Latitude Earth's magnetic field lines run almost flat along the surface near the equator and plunge steeply into it nea…