Simple machines

How many types of simple machine are there an what are they ?

• 5,Wheel and axle, wedge, screw, inclined plane, pulley

• 6,Wheel and axle, wedge, screw, inclined plane, pulley

• 6,Wheel and axle, wedge, screw, inclined plane, pulley, lever

• 6,Wheel and axle, wedge, screw, inclined plane, lever

when will you need to apply less effort to carry a thing on a lever

• when fulcrum is between the load and the effort

• when fulcrum is nearer to the load than the effort

• when fulcrum is nearer to the effort than the load

• none of these

In a 1st class lever the _______ is in between

when is the friction more

• on a desert

• on the beach

• on the road

a knife is a

• wedge

• lever

• wheel & axle

• pulley

which of these are not a simple machine

• spring

• fort

• car

• sewing machine

what would we need to make both equal height

• add more effort

• remove the fulcrum

• add more load

how many types of levers are there

• 3

• 3.1

• 3.0

• 9

write f for fulcrum , e for effort, l for load

which type of lever is this ?

• 3rd class

• 1st class

• 2nd class