# P2a

- Created by: anniedarlington
- Created on: 01-04-15 10:48

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- P2a
- kinetic energy
- E=1/2mv2 is the same as square root of v=2E/m
- doubling speed increases Ek by a factor of 4
- energy = distance x force

- elasticity
- F = k x e
- k = spring constant, e = extension

- limit of proportionality - the maximum force that the elastic object can take and still extend proportionally

- F = k x e
- car safety features
- by increasing the time, the change in momentum happens more slowly, so impact on passengers is reduced
- crumple zones - convert KE into HE and SE as it changes shape
- air bags- transfer KE of passenger onto gas in air bags which escapes through pores in materia
- material of belt stretches, absorbing energy

- charge, current and time
- Q= I x t

- filament lamps
- gets hot - more heat energy - more vibrations of ions - harder for charge carrying electrons to travel through the filament so current cannot flow as easily - increased resistance

- series circuits
- as more lamps/components are added, current is smaller as lamps increase resistance

- kinetic energy

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