Universal Forces 12 4 Notes define electromagnetic force
- Slides: 15
Universal Forces 12. 4 Notes
define electromagnetic force • A combo of electric and magnetic force that is associated with charged particles. • Electric force and magnetic force are the only forces that can attract and repel.
What are electric forces? • Forces that act between charged objects or particles (electrons and protons). • Opposite charges attract and like charges repel.
What are magnetic forces? • • Forces that act on certain metals, poles of magnets and on moving charges.
What type of force acts between particles of the same electrical charge? • Electric force
What are the two forces that hold a positively charged proton nucleus together? • Strong nuclear force and weak nuclear force
explain strong nuclear force • A powerful force of attraction that acts only on protons and neutrons holding them together
What is the range over which strong nuclear force acts? • Approximately equal to the diameter of a proton
How strong is strong nuclear force? • 100 times stronger that the electric force of repulsion at these distances
explain weak nuclear force • It is another powerful nuclear force yet it is weaker than strong nuclear force and acts over a shorter range.
What is gravitational force? • An attractive force between any two masses.
Newton’s law of universal gravitation • Every object in the universe attracts every other object.
What factors affect gravitational force? • Mass and distance
describe centripetal force as it relates to our moon’s orbit • Centripetal force is a center-directed force that continuously changes the direction of an object to make it move in a circle. • The center-directed force of Earth’s gravity pulls the moon into a nearly circular orbit around Earth.
explain the tide cycle • The gravitational pull from the moon produces 2 bulges in our oceans. • One bulge is on the side closest to the moon, • the other bulge is on the side farthest from the moon. • The Earth rotates once per day beneath these 2 bulges which results in high and low tides.