The boys didn’t let me forget my promise to do another Simple Machine activity this week.
Here’s the activity I promised and delivered:
First we measured the effort to lift the load without the lever.
The boys then set up a 1st class lever and measured the effort, which was less than lifting the load without the lever.
Next up was a second class lever, with the load in the middle. It required a little more effort than the 1st class lever.
And lucky last was the 3rd class lever. Woah! It took some effort to lift this load!
(No we weren’t holding the fulcrum when we measured the effort. I was worried about the load crashing to the ground while I snapped the photo.)
So there you go. Science complete for the week…okay the day…we enjoy it so much we do Science quite regularly 🙂 .
Oh do you want a nifty trick for remembering which sort of lever is which?
Okay you twisted my arm.
Just remember F.L.E.
F for fulcrum.
L for load
and E for effort.
If the fulcrum (F) is in the middle it’s a 1st class lever.
If the load (L) is in the middle it’s a 2nd class lever.
And if the effort (E) is in the middle it’s a 3rd class lever.
Clear as mud?!