summary

Honelako gehiago

Easter 2012

Daniel Sima‑k egina

Captain James Cook

Hayley Corcoran‑k egina

World Wide Web Assignment

Matthew Pearson‑k egina

สมเด็จพระเจ้าบรมวงศ์เธอ เจ้าฟ้าจิตรเจริญ กรมพระยานริศรานุวัดติวงศ์

Chotika Jaosakuldee‑k egina

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