When a running ball hit a ball at rest, the latter starts moving and the moving ball comes to rest (when they have same mass ). Here the energy is transferred from the first ball to the second due to impact. The collision plays an important role in physics.
When a ball hits a wall, the energy cannot be transferred to the wall because of its heaviness. Hence the ball bounce back with the same speed and the energy.
The 'light' particle photon collides on metal like zinc.Cconsequently an electron is ejected out. This is the photoelectric effect widely used in electronics.
If the air molecules collides on the walls of the container(tubes and balloons) like balls on the wall, it gives raise to pressure. More air, more collisions, more pressure.
When a meteor hits a planet, the energy gets dissipated and creates a crater. The moon has so many craters.
If a neutron impinges on a atom like uranium and thorium, it splits up the atom and lot of energy is released. It is the principle of atom bomb and nuclear reactor.
World largest single machine is situated near Geneva. It is called 'Large hadron collider'. It is a circular tunnel of 27 kilometers long and burried deep in the earth at 175 meters. It is manned by more than 1000 scientists and engineers from 100 countries. In the tunnel atomic particles are accelerated by powerful super magnets. Two beams of atomic particles travel in opposite directions in the ring and collide. When the particles make the impact , scientists study, infer and make conclusions and discoveries.
The particle 'Higgs Bosson' (God's particle which is responsible for the mass) is discovered in this machine. People hopes to answer many questions about physical universe using this collider.
Road Accidents are collisions that should be prevented at all costs.
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