Physics-Energy And Work
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Work =
Force* distance
Work
Measure of amount of E used in moving object
Power
rate that works done P = work done/time
KE
Energy of moving object Ek = 0.5mv^2
Double mass of moving object
double KE
Double velocity =
KE increase by factor of 4
Travelling at higher speeds =
Need longer distance to stop
PE
E possessed by an object due to position or structure • gives capacity to do work
Elastic potential energy
Stretched or compressed material has EPE • converted to KE when released & return of original shape
GPE
Energy object has due to its height above ground GPE = mgh
Conservation of energy
E may be transferred from one form to another but never created or destroyed
Total energy in system …
Stays the same Et = Ep + Ek
Energy
Capability to do work
Efficiency of conversion
Measure of how much useful E produced
Mechanical E
Sum of PE & KE, always conserved, one goes down, other goes up by same amount, as long as no non conservative factors eg: friction