Physics

space-science

Earth’s escape velocity is approximately 25,020 miles per hour (about 11.2 kilometers per second) at the surface. This is the minimum speed an object needs, solely from its in...

physics

The average value of velocity tells you how fast an object moves on average over a chosen time interval. Unlike instantaneous velocity at a single moment, average velocity summa...

science

Glow in the dark experiments explore phosphorescence, the process by which certain materials absorb light and re-emit it over time. These activities illuminate core ideas in che...

Science & Physics

Sound propagation is the process by which acoustic energy travels through a medium as a mechanical wave, transferring pressure variations from one particle to the next. This gui...

Science & Space

Day and night occur because Earth spins on its axis in an eastward direction, completing one full turn roughly every 24 hours. This rotation alternates a given location between...

science

Electric potential at a point in an electric field is the amount of electric potential energy per unit charge at that location. It is a scalar quantity, measured in volts (V), a...

Science & Mathematics

Velocity describes how an object’s position changes over time, including both speed and direction. It is a vector quantity, so you must specify direction along with magnitude....

science

Mass as a measure of inertia describes how strongly an object resists changes to its motion. In physics, inertia is the tendency of any object to keep doing what it is already d...

Science and Physics

In short, yes—but only under very specific conditions that are rare in everyday life. Shattering glass with your voice requires matching the glass’s resonant frequency with...

science

A sound wave is a traveling vibration that carries audio energy through a medium such as air, water, or solids. When an object vibrates, it pushes and pulls on nearby molecules,...