1What jobs are a crowbar and a hammer used for?
2How can these tools let a small force lift a large weight?
3What other tools of daily life work in the same way?
4From a broom, a knife, scissors, a bottle opener, a hoe, pliers, a spoon and a pen, identify the levers and write each one's name and class in a table.
5Collect levers found or used around you and classify them into first, second and third class.
6What is a lever? Name its three main points.
7How is effort distance different from effort arm?
8Which class of lever is a wheelbarrow? Give the reason.
9How are second and third class levers alike, and how are they different?
10When is a hammer a third class lever and when is it a first class lever?