Simple Machines
What does a pulley do?
Lift a load.
How many types of levers are there?
Three classes of lever.
Name the three types of catapults.
Trebuchet, mangonel, ballista.
What were catapults used as historically?
War machines.
What was the source of potential energy in our catapults?
Rubber bands.
What does a wedge do?
It splits an object or embeds itself.
What is a fulcrum?
It is the point by which the rod is fixed and turns.
Which catapult is the most accurate?
A ballista.
What doesn't a simple machine do?
Create its own energy.
What do you call the object that a catapult shoots?
Projectile.
What does a lever do?
Force applied to one end lifts the load at the other end.
Where is the fulcrum on a Class 1 lever?
Between the load and the effort.
Which catapult will launch a stone the furthest?
A trebuchet.
What does a simple machine do?
It produces a force or power and controls the direction of that force.
What lever is used in most catapults?
Lever.
What does an inclined plane do?
They raise a heavy load little by little using a small amount of force.
Give an example of a Class 2 lever.
A wheelbarrow (but will accept other correct answers).
Give an example of how a catapult is used today.
They are used on the flight deck of a boat to launch the jet planes.
What is the difference between an inclined plane and a screw?
They are the same thing, a screw is just wrapped around a round rod.
What is an example of very early biological warfare?
Conifer catapults to shoot a dead, sick body over a castle wall.
What does a wheel and axel do?
Can be used to lift things or move them by rolling them instead of sliding them.
A stapler is an example of what class of lever?
Class 3 Lever.
What is a catapult?
A catapult is a device used to launch a projectile a great distance without the use of explosives.
What three simple machines are used to create a pizza cutter?
A wheel and axel, a wedge, and a lever.
Which type of catapult relies on a heavy weight to provide the potential energy?
Trebuchet.