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Class 6 Viva ICSE Physics Chapter 4: Simple Machines Concept based questions: Higher Order Thinking Skills  1. Aman was helping his grandmother in the kitchen. She gave him a jar of pickles to close. Aman noticed that the lid had spiral grooves inside, and he had to turn it several times just to move it down a tiny bit to seal the jar. Q: Identify the simple machine used here. A: The simple machine is a Screw. Q: If the threads on the jar were further apart (a larger lead), would it be easier or harder to tighten? Why? A: It would be harder. A larger lead means you move a greater distance with one turn, which requires more muscle power (effort). A smaller lead makes the work easier. Q: Why is this lid called a "force multiplier"? A: It is a force multiplier because Aman applies a small force by turning the lid, and the screw converts it into a very strong downward force to seal the jar tightly. 2. Rohan was going on an evening walk with his father. On the way, he crossed a co...