Structures
A ____ is a group of elements that can support weight or load.
Levers have a rigid bar that moves on a point called a ____.
pivot
Several cogs that are connected
What does the word "build" mean?
to construct
Who was Archimedes?
One of the greatest Greek inventors of all time.
What form has a very strong shape?
triangle
How many classes of levers are there?
three
the crank and cogs
What should you do before moving an electrical machine?
Make sure it's unplugged.
Which of Archimedes' inventions was using to raise water and irrigate crops?
What determines how strong a structure is?
What do levers, pulleys, wheels and inclined planes have in common?
They're all simple machines.
The ____ is a bent lever that transmits its movement to an axle.
Sometimes we have to wear this to use machines safely.
Protective clothing
Who invents the first high-speed electrical trains?
The Japanese
What three elements do all structures have?
Girders, pillars and load
Which simple machine helps us lift objects more easily, a pulley or a lever?
a pulley
What do gears do?
They transmit movement and change the direction of the movement.
These machines could throw heavy stones over long distances. What were they called?
Catapults
How did the first steams engines heat water?
With coal.
TRUE OR FALSE:
Many structures have triangular components.
True
a ramp
These components form the mechanisms of complex machines. What are they called?
Mechanical components
What does "SMART" stand for?
Safe, Meet, Accept, Real and Tell
renewable