• Observe that some of the see-saws are supported at the center while others are off-centered.
• Choose a see-saw having its fulcrum(support) at the center and enjoy the see-saw along with one of your friends.
• Choose another see-saw with an off-centered fulcrum and ask two persons to sit on the shorter side and you sit on the longer side to operate the see-saw.
• A see-saw is a lever. A small child on the longer side can lift his parent on the short side in an off-centered see-saw.