# SCIENCE FOR GRADE 1-8 Understanding LEVERS

Under construction…

A see-saw is a lever with the fulcrum in the middle. A fulcrum is the word for the point about which the lever moves, or better rotates…

When there are the same number of children of the the same weight at each end of the equally long lever arm, then the see-saw is balanced. A small force or kick-off by the  lower group moves the see-saw up and lowers the other group, great fun.

Oh, Oh, the left kid is a bit mean. If he lets go, the other kid will fall down, that’s why he looks a little worried.

A pair of pliers are two levers put together at their fulcrums. Don’t stick your finger in the short end of the pliers while you squeeze the handles. These two levers give you extra strength or mechanical advantage, and it is a great tool to squeeze bits of metal together, or to grab a nail and pull it out of the plank…

Now this is a bit of a joke: The little girl balances the fat man, but it is not a real man, just a cutout or a mannequin.

If it was real then the heavy man should sit much closer to the fulcrum or center of the see-saw and the girl should sit much farther away from the fulcrum so she has enough mechanical advantage to balance the weight of the man…