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Science Library Quiz

Turning effects

Instructions: answer the questions, check them carefully, and when you are sure they are all right, press submit. The number of correct answers will be displayed.

Question 1: A boy weighing 600 N sits 1.2 m from the centre of a seesaw. How much must a friend's mass be to balance him if he sits on the other side the same distance from the centre?

Question 2: A girl weighing 480 N sits 1.0 m from the centre of a seesaw. How far from the fulcrum must her 60-kg mother sit to balance her? Seesaw moments

Question 3: If you look carefully at a crane, you will notice that there is always a large mass of concrete on one side. Why is that? Crane

Question 4: Which of these is not an example of the lever principle?

Question 5: What is the distance a 65kg mother must sit on a seesaw to achieve equilibrium with her two children on the other side? Her 35kg daughter is sitting 2.0m from the fulcrum, and her 45kg son is sitting at 1.8m from the fulcrum.

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