The Four Forces Electromagnetic Strong Weak gravity Electromagnetic
- Slides: 7
The Four Forces • • Electromagnetic Strong Weak gravity
Electromagnetic Force Ø Electromagnetic force: an attraction or repulsion between particles. Ø If the particles have the same charge they are repelled. Ø Opposite charges attract Ø Electrons are kept in orbit because of opposing attraction for the proton But what keeps the positive protons from repelling each other? ? ?
Strong Force Ø Ø Ø Opposes the electromagnetic force’s repulsion of protons! It is the glue for the nucleus! Without the strong force the atom would not stay together. Only works when the protons are close. It is the strongest of the forces.
Weak Force: Ø Is the power for the sun Ø Is responsible for radioactive decay Ø Radioactive decay: is when the neutron changes into a proton and electron Gravity: Ø the weakest force Ø Is the force of attraction exerted between all objects in nature. Ø Not clearly understood
Closure • Which force is the weakest and why? • Which two forces keep the atom’s structure?
1. Gravity: the weakest force Is the force of attraction exerted between all objects in nature. 2. The strong and the electromagnetic force, Opposite charges attract, It is the glue for the nucleus! Without the strong force the atom would not stay together.
