Assignment 4

How has e+mc2 affected you?

This equation explains how energy is released when mass is broken down. Examples of this relationship between mass in energy can be seen every day: the light and heat we get from the sun; the energy that is generated from nuclear power stations. In fact, our very existence depends upon this equation. Paradoxically,nuclear warfare, which has the potential to wipe out life as we know it, is also an example of this equation.

How would you compare the four forces?

In terms of magnitude, the strongest of the four forces is the strong nuclear force. The weakest magnitude is gravity (which seems paradoxical when one considers that we need something the size of earth to hold down!). In terms of distance, the strong and weak nuclear forces are stronger than the electromagnetic or gravitational forces.

Personally, I had some difficulty understanding each of these forces during class. So I looked at several definitions on the Web until I found some to which I could relate. They're listed below for those who may be interested.

Electromagnetic force: This force gives material objects the illusion of solidity, even though they are composed primarily of empty space. James Clark Maxwell discovered that magnetism, electricity, light, radio waves, x-rays and properties of solids, liquids, and gases were different aspects of the electromagnetic force.

Strong force: This force is responsible for the binding of protons and neutrons into atomic nuclei. It also underlies interactions between all particles containing quarks (an elemental subatomic particle).

Weak force: This force relates to some forms of radioactivity and is responsible for the nuclear fusion reaction that fuels the sun.

Gravity: This is a natural force of attraction exerted by a celestial body, such as the earth, upon objects that are near its surface.

What is the function of gravity?

Gravity is the force that keeps earth and all of the planets in their orbits around the sun. It holds celestial bodies in place. It helps to make life as we know it possible. Without it, we would not exist.