Strong force, weak force, and gravity

Particle Physics

Particle Physics - 2011 is rated/received certificates of:

UK:PG

G40 is a supernova remnant. Particle physics is the study particles, radiation and matter. One would be able to study the properties of the G40 by applying the principles of particle physics

If no force acts on a particle, that particle will either be motionless, or will move in a straight line; this follows from Newton's laws of motion. When a particle is moving in a circular path, the direction of its motion is constantly changing, and to change the direction of motion requires force. We know that force equal mass times acceleration, which is the basis of all physics, as originally stated by Newton. So if a mass is being accelerated, then force is being applied. That is an inescapable conclusion. And only acceleration can change the direction in which a particle moves.