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The Four Forces that Shape Our Universe!

Presented at UCLA Explore Your Universe outreach event, Nov. 17, 2013
by

Shanna Shaked

on 21 January 2014

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Transcript of The Four Forces that Shape Our Universe!

Four fundamental forces
govern
every single interaction
in the universe!
Theories that postulate the unification of the strong, weak, and electromagnetic forces are called Grand Unified Theories (often known by the acronym GUTs).

Theories that add gravity to the mix and try to unify all four fundamental forces into a single force are called Superunified Theories. The theory that describes the unified electromagnetic and weak interactions is called the Standard Electroweak Theory, or sometimes just the Standard Model.
Uniting theories
The Four Forces that Shape Our Universe!


`
1. Create an image with
at least one example or use of each of the four forces
. This image can be drawn, or done on a computer, or a collage. Label the examples with letters on the image.

You will hand in your image at the end of the week.

2. Identify the forces in the images of the other students. (due next week)

To make things easier, you will work in groups, so go to the corner with your number on it and start brainstorming ideas for images.
Homework
A force is a PUSH or PULL
on one object by another object
causing a change in:
direction
speed
, or
shape


Which force did you see in the beginning of the video?
What is a force?
Which direction is the force on the ball?
Gravity (on Earth's surface)
Why doesn't space station fall to Earth?
Which direction is the force on the orbiting earth ball?
Centripetal Force makes things go in Circles
What keeps the protons stuck together?


What is the difference between a proton and a neutron?
http://www.polleverywhere.com/multiple_choice_polls/LTE1NjcwMDkwMjE
Quick review


The weak force does which of the following?


Rank the strength of the four forces:
http://www.polleverywhere.com/multiple_choice_polls/MjAyMjUzODI1OA
http://www.polleverywhere.com/multiple_choice_polls/MjA4MTc0MDAyNA
Shanna Shaked
UCLA Physics Lecturer

Mass curves space time to
pull
objects together -->
Gravity

Every particle in the universe continually attracts every other particle!
Range of Force
Strength
of
Force
Proton Nucleus Atom YOU Earth Orbit Universe
10^-18 10^-15 10^-10 1 10,000 10^12 10^27 meters
10^38





10^36





10^25
Gravity
Light is an
electromagnetic wave
that is created
by the
electromagnetic force.

Force between electrically charged particles that can
attract and repel

(push and pull).
Range of Force
Strength
of
Force
Proton Nucleus Atom YOU Earth Orbit Universe
10^-18 10^-15 10^-10 1 10,000 10^12 10^27 meters
10^38





10^36





10^25
Gravity
Electromagnetism
http://www.polleverywhere.com/multiple_choice_polls/MTAwNjI1MzU0OA
Which type of force keeps the electron orbiting the proton?
Range of Force
Strength
of
Force
Proton Nucleus Atom YOU Earth Orbit Universe
10^-18 10^-15 10^-10 1 10,000 10^12 10^27 meters
10^38





10^36





10^25
Gravity
strong
Nuclear
Force
Electromagnetism
Range of Force
Strength
of
Force
Proton Nucleus Atom YOU Earth Orbit Universe
10^-18 10^-15 10^-10 1 10,000 10^12 10^27 meters
10^38





10^36





10^25
Gravity
strong
Nuclear
Force
Weak
Nuclear
Force
Electromagnetism
"All of the rocky and metallic material we stand on, the iron in our blood, the calcium in our teeth, the carbon in our genes were produced billions of years ago in the interior of a red giant star.
We are made of star-stuff.
"
--Carl Sagan “The Cosmic Connection: An Extraterrestrial Perspective”, 1973
They have similar masses and different charge.
Do opposite charges attract or repel?
Full transcript