summary

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Medieval war machines

Ballista

physics (C,B)

composition/size

elastic potential energy -> kinetic energy

building and design (H)

range < trebuchet

accurate

tension

history (H)

'throw'

Medieval Era

Greeks

Mangonel (F)

power

swing arm

twisted rope

firing

trigger release

loading = inefficient

Trebuchet (A,D,E,G,I)

optimisement

sling length = length long arm

weight ratio = 133:1

beam ratio 4:1

variables

fulcrum position

short + long arm

sling length

physics

lever arm = large amount of movement

potential energy -> kinetic energy

components

counterweight

sling

lever arm

fulcrum