Vocabulary
What is the scientific definition of bow and arrow?
A bow and arrow is a projectile weapon system used in the art of archery. The bow is a flexible piece of material which shoots aerodynamic projectiles called arrows
What is the definition of Trebuchet?
Gravity powered sling – with counterbalance
Can launch objects up to 600 m
Comes from the French word “Trebucher” meaning “throw over”.
1) What are the three types of bows and arrows?
Compound, Recurve & longbow
What are the three main types of catapults?
Mangonel, ballista & trebuchet
How can a watercraft be powered?
Oars (man power), sails (wind), engine (gas/nuclear)
What is the definition of draw weight?
Draw weight is the amount of force needed to pull a bow
What is the scientific definition of weight?
The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg.
Since the weight is a force, its SI unit is the newton.
What is draw weight? What is Draw length?
Draw weight is the amount of force needed to pull the bow string back.
Draw length is how far you can pull the bowstring back.
How does a trebuchet launch a projectile?
It uses gravity and a counter weight to allow it to shoot a projectile when it is released.
What is Archimedes Principle?
The idea that the upward buoyant force is equal to the downward gravitational force. The object will displace the fluid equal to the amount of weight.
What is the definition of Archery?
the sport or skill of shooting with a bow and arrows, especially at a target
What is the definition of density?
Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
What is archery?
Archery is the art, sport, practice, or skill of using a bow to shoot arrows.
What does a ballista shoot? How does it shoot its projectile?
Large arrows/bolts. A ballista uses two torsion arms to be pulled back and launch the arrow.
What does it mean to be positive, neutral and negatively buoyant?
Positive buoyancy = float
Neutral buoyancy = chilling in the middle
Negative buoyancy = sink
What is the definition of mangonel?
Torsion powered catapult.
Hurled objects from a cup on an arm.
400 meter range.
Capabilities in between a Bastilla and a Trebuchet.
From the Latin word “manganon”, meaning “an engine of war”
Created by the Romans.
What is the definition of displacement?
The occupation by a submerged body or part of a body of a volume that would otherwise be occupied by a fluid.
What is archer’s paradox? explain
You need to aim slightly further than the target so that when the arrow wobbles it hits the target.
List a pro and con for each of the three catapults.
Mangonel: (+) moveable, middle range offense (-) Inaccurate, not as powerful as it could be
Ballista: (+) small, highly accurate, quick reload (-) Not as powerful as it could be, torsion could break
Trebuchet: (+) Strongest, most range
(-) Not accurate, hard to reload, heavy, not moveable
A cube has a volume of 14 cm3 and a mass of 70 g? Will this cube float or sink in water?
Density = m/v = 5 g/cm3 Sink
What is the definition of ballista?
Similar to a giant crossbow.
Tension powered.
Launched darts up to 200 m.
Comes from the Greek word “Ballistes”, which means “to throw".
What is the definition of watercraft?
This is a term that defines water-borne vehicles: this includes ships, boats and submarines.
How can you reduce archer’s paradox?
Fletching can help add spin to the arrow so that it reduces the paradox. Or using a release button to let go of your bow string without sliding off your fingers.
Is a catapult a useful siege weapon? Why or why not?
Yes – can break down walls and kill people
No – Takes times to reload, not accurate
What is the difference between a boat and a ship? Explain.
Boat is small, has less capacity, and usually powered by oars, sails or small engines
Ships are large, massive, and powered by engines/nuclear power