Consider the following statements about a seesaw used in a playground. 1. The central support acts as the fulcrum. 2. The weight of a child on one side may act as the load. 3. The force applied by a child on the opposite side may act as the effort. 4. A seesaw is an example of a first-class lever. Which of the above statements are correct?
1, 2, 3 and 4
On a seesaw, the central support is the fixed pivot (fulcrum); the weight of a child on one side is the load being balanced, and the force applied by the child on the other side is the effort; since the fulcrum lies between the load and the effort, a seesaw is indeed a first-class lever.
Hence, statements 1, 2, 3 and 4 are all correct.
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