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Science 4th grade - MACHINES
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Archimedes invented simple machines with...
CATAPULT, MIRRORS, SCREW and LEVER
The longer the ramp...
the less inclined it is.
it's the simplest machine: it only has 1 part.
INCLINED PLANE
What's an INCLINED PLANE?
It's a ramp used to LIFT and LOWER objects
Say the parts of a pulley
WHEEL, AXLE, GROOVE and ROPE
A wheel and axle and pulleys make it...
 
EASIER TO LIFT OR LOWER HEAVY OBJECTS
 
MORE DIFFICULT TO LIFT OR LOWER HEAVY OBJECTS
 
EFFORTLESS
What are the types of levers?
1- Fulcrum in the middle 2- Load in the middle 3- Effort in the middle
It's the force applied by the person.
EFFORT
It's the force exerted by the object.
LOAD
It's the point where the lever turns.
FULCRUM or PIVOT POINT
The types of simple machines are...
Levers, wheel and axle and pulleys, and inclined planes
A lever is...
 
A rigid bar with a fulcrum
 
A flexible bar with a fulcreus
 
A bar
A complex machine uses energy from...
 
Electricity or combustion
 
Animals or people
 
Electricity
A simple machine uses energy from...
 
People or animals
 
Animals
 
Electricity
A complex machine has...
 
Many parts
 
1-2 parts
 
3 parts
A simple machine has...
 
1 or 2 parts
 
2-4 parts
 
many parts


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