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# Momentum and Energy

### Quick Introduction

Collision – elastic a collision that conserves kinetic energy and momentum
Collision – inelastic a collision the some kinetic energy is changed into heat, light, sound, deformations...; momentum still conserved
Conservation of p the sum of all momenta of the particles of a system is unchanged after an event (explosion or collision)
Energy the ability to make changes
Energy a condition of an object or system of objects; scalar quantities (no direction); unit in Joules; 1 J = 1 N-m = 1 kg-m2/sec2
Energy – gravitational gravitational potential energy is energy stored in an object-earth system because work was done “against” gravity
Energy – potential “Stored” energy; energy created because a force “acted” through a distance; stored in a system of objects
Energy – types kinetic, gravitational potential, heat, light, sound, electromagnetic radiation, high speed particles, etc.
Energy – Work a transformation mechanism for changing one mechanical energy into another (kinetic to potential) or to heat
Energy – Work theorem The change in kinetic energy is due to the work done on a moving object
Impulse change in momentum (change in p)
Impulse – due to force change in momentum due to a force “acting” for a time period
Momentum “quantity of motion”; vector quantity; one of the properties of matter
Newton’s 3rd Law the change in p of one object during an interaction equals the change in p of the other object except in opposite direction
Power Rate of work being done; units are “watts” 1 watt = 1 Joule/sec = 1 kg-m^2/sec^2
Created by: brownglarry

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