Universal Forces 12.4 Notes
Electromagnetic Forces Consist of Electricity and Magnetism Electric Forces – act between charged objects or particles. (protons & electrons) Magnetic Forces – act on certain metals. Magnets have poles with opposite charges.
Electromagnetic Forces Acts on charged particles like Protons and Electrons
Nuclear Forces Forces within an atom Strong Nuclear Force – hold protons together inside the nucleus Is “strong” because like charges repel. It takes a lot of force to hold a bunch of (+) charges together. Weak Nuclear Force – holds the atom together.
Strong Nuclear Holds Protons and Neutrons together Works over a very short distance Holds Quarks together
Weak Nuclear Works with radioactive decay Works over a very short distance Acts on all particles Source of sun’s power
Gravitational Forces Newton’s Law of Universal Gravitation. All object in the universe are attracted to each other by the force of gravity. The force depends upon the masses of the objects and the distance between the objects.
Gravity between Earth and Moon causes ocean tides