Algodoo

radial gate advantage :
force of water will all go to 1 axle so the friction while opening or closing gate is reduced to a smaller surface (axle)

wall sample to place on platform to see power of water washing away wall
bricks that wash away will fall down and disapear

controls
dam up and down W + S [hold]
river flow Q [toggle]
water pump A [toggle]
barrier E + D [hold]