Military Vehicles
Underwater vehicle
Submarine
invented by the Chinese, first used for fireworks
Gunpowder
True or false: a catapult is a inclined plane
False
Define Sonar
Sound Navigation and Ranging
These weigh 40-70 tons
Tanks
Sulfur, saltpeter, and ___ are the ingredients in gunpowder
Carbon
This uses a counterweight to launch things
A trebuchet
Define Radar
Radio detection and ranging
At what depth is a sub designed to operate?
2000- 5000 feet deep
Ballistics is the study of ___
Ballistics is the branch of physics that studies the movement of projectiles
True or false: a ballista is like a giant crossbow and it fires bolts
True
Define ballast
A material carried for the purpose of changing the weight of a vehicle
In BC times, these animals served a similar purpose to tanks in battle
elephants
Define buoyancy
The upward force that a liquid or gas exerts on an object
Tanks usually use a ___ engine
Diesel
Define a first class lever
Has weight at one end, fulcrum in the middle, and the effort at the other end