AST201H1 Lecture : conservation laws and energy from lecture 3

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Stefan Mochnacki

Document Summary

The total momentum of interacting objects cannot change unless an external force is acting on them. Interacting objects exchange momentum through equal and opposite forces. Energy is conserved but it can transfer, convert. *energy can change type but cannot be created or destroyed [conservation law of energy] Ex: in a rock, in air, in water. Thermal energy is related to temperature but it is not the same. Temperature is the average kinetic energy of the many particles in a substance. *lower amount of particles, lower temperature, less movement. Thermal energy is a measure of the total kinetic energy of all the particles in a substance therefore depends on both temperature and density. *total energy is the same at all points in the ball"s flight, fall. Mass itself is a form of potential energy. Small amount of mass can release a great deal of energy.