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How to determine the type of the lever?
1 determine the location of the effort force, resistance force and the fulcrum 2 determine the midpoint
Mention one example for : levers that move force from one place to another
Manual broom
T/f from the functions of the levers is to decrease distances
False
-------- and - - - - - - - - are examples of levers that increase force.
Crowbar - nutcracker
Pincers are composed of ( one - two - three) first class levers
Two
T/f nutcrackers are composed of three second class levers
False
Tweezers are composed of - - - - - - - - third class levers, where the midpoint is - - - - - - -
Two _ the effort force
Hammer claw is an example of - - - - - class levers where the midpoint is - - - - - - -
First - the fulcrum
Fishing hook is an example of - - - - - class levers
3rd
Levers can be classified into ………… types.
3
Scientific term : the fixed point on the rigid bar on which the bar rotates
Fulcrum
Scientific term : a force that is exerted by a person to equlilbrate the resistance force
Effort force
Scientific term : the most popular type of levers in our daily life
1st class levers
The fulcrum in scissors lies between the Resistance and the effort
T
T/F Pliers are composed of three first class levers
F
T /F the fulcrum of any lever is always between the Resistance and the effort
F
What happens if we didn't have levers
Many tasks will not be performed easily
Gr : the manual broom is considered as an increasing distance lever
Because you move your hands for small distance at the upper part of the broom and the loeer part moves a longer distance
Mention 3 functions of the e levers with examples
Increase speed example hockey bat - increase distance example manual broom - avoiding danger examples coal holder
Define 1st class levers
They are levers that have the fulcrum between the Resistance force and the effort force
Define 2nd class levers
They are the levers that have Resistance force between the fulcrum and the effort force
Define 3rd class levers
They are the levers that have the effort force between the Resistance force and the Fulcrum
Gr : wheelbarrow is a second class lever
Because the resistance force is between the effort force and the fulcrum


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