
Physics
Explainer: The fundamental forces
Four fundamental forces control all interactions between matter, from the smallest subatomic particles to the largest structures in the universe.
By Trisha Muro
Four fundamental forces control all interactions between matter, from the smallest subatomic particles to the largest structures in the universe.
The force of gravity holds us on the ground, keeps planets in orbit and extends throughout space. A very weak gravitational pull is called microgravity.
Pressures within these pyroclastic flows may be as much as three times as high as observations had suggested.
Baby ducks save energy by surfing their mother’s waves, but only if they do it in an orderly line.
Mass shows how much an object resists speeding up or slowing down when force is applied — a measure of how much matter is in it.
Its rolling acrobatics allow this robot to move especially swiftly — much as a fictional new Disney character can.
X-rays scans of a box of mixed nuts now reveal why large Brazil nuts rise to the top.
A toy called a light mill inspired researchers to invent a new way to fly. They’re using light to levitate small nanotube-coated discs.
Acceleration is a change in velocity. That could mean a change in speed or in direction.
If you have ever tried to catch a resting butterfly, you know they are surprisingly difficult to nab. A new study helps explain why.