CEM 141 Lecture Notes - Lecture 4: Inverse-Square Law, Electromagnetism, Boiling Point
Document Summary
Both of these interactions follow an inverse square law. F=q1q2/r^2(electrostatic attraction between charges)(electromagnetic or electrostatic force is much stronger and can be attractive and repulsive) f=m1m2/r^2 (gravitational attraction between masses)(gravitational forces are too weak to be detected at the atomic/molecular level) Electrostatic forces stop us from falling through the earth. If something is not moving, either there is no force acting on it or the forces acting on it are equal and opposite. We can stand on earth because the force of gravity is equal to the electromagnetic force. Any change in matter is accompanied by a change in energy 2. Changes in energy are caused by changes in forces 3. energy is conserved (depends on the system) System(depends on the part of the universe you are looking at) Energy is never lost- it can be transformed or transferred. Kinetic and potential (all forms of energy are related to these two)
