PHYS124 Chapter Notes - Chapter 9, 10, 11: Momentum, Mt Vector, Kinetic Energy

• School: University of Alberta
• Department: Physics
• Course: PHYS124
• Professor: Sharon Morsink

Document Summary

Since kinetic energy only tells us the energy of motion but not direction, we need linear momentum. Vector quantity (same direction as velocity v) Use vector addition (p2 = pa2 + pb2) at . Change in momentum (1 direction) = after before. Kinetic energy gained is work done by force = f*s. Momentum gained is the impulse of the force = f t. Momentum change is in net force direction. If no external forces acting on system, then f = 0, p = 0 and thus momentum is conserved. Internal forces change individual"s momentum, but have no effect on total momentum of system. Greater mass will have less speed: place on opposite sides (= to each other) to determine effect of mass on the velocity (mass is inversely proportional to velocity) Collision b/n two objects that have no external force (no net acceleration) acting on objects (closed system)= conserved momentum = momentum before and after is same.