Two charged pieces of plastic wrap spring apart. Which field is responsible?
This topic sorted forces into three families: magnetic, electric, gravitational. The everyday world seems to have far more. Friction, the floor's push on your feet, a rope's pull. Does physics keep a separate rulebook for each one?
No. Physics traces every force back to a small set of fundamental forces.
Take friction. A sneaker grips a gym floor because the atoms of the two surfaces attract and repel each other electrically. So friction is the electromagnetic force at root.
At root, which fundamental force produces the friction between a bike tire and a road?
The floor's push on your feet traces back the same way: the atoms of the floor repel the atoms of your shoes electrically. And a rope's pull traces back to the electrical attractions holding the rope's own atoms together.
Two of this topic's three families are secretly one. The electric force and the magnetic force are two aspects of a single force: the electromagnetic force.
Which two forces are two aspects of one single fundamental force?
Gravity is a fundamental force of its own.
A gymnast's hands grip a bar without slipping. At root, which fundamental force does the gripping?
Grip is friction between the hands and the bar.
Friction is the atoms of the two surfaces attracting and repelling each other electrically.
Electric forces are one aspect of the electromagnetic force.
The electromagnetic force does the gripping.
Vera says a small set of fundamental forces underlies every everyday force. Is Vera correct?
Which statement about forces is correct?
A chain tows a trailer. At root, which fundamental force lets the chain pull?
Idris lists the electric force and the magnetic force as two separate fundamental forces. Which correction is right?