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Brief Questions and Answers (3 marks each)
Why is a long spanner used to open or tighten nuts of a vehicle's tire? Why is a small nut not suitable for an extra-long wrench?
Why are door knobs fixed at the edge of the door? What happens if the door knob is at the middle of the door?
If you drop a feather and a bowling ball from the same height, which will reach terminal velocity first? Which will hit the ground first?
Why do ice skates effortlessly slide on ice, while your shoes cause skidding?
Explain why it's easier to push a car on flat tires than inflated ones. What happens to the frictional force between the tires and the road?
When standing on a crowded school bus, which stance provides better stability: legs joined or legs spread apart?
Why is a moving bicycle easier to balance? Relate this to the principles of rotational motion.
Why is a pencil standing on its tip unstable, and what factors affect the stability of an object balanced on a point?
What happens if a driver takes a curve too fast? How does centripetal force play a role in keeping the car from skidding off the road?
Consider a situation where you swing a ball connected to a string in a circle. How does the tension in the string vary as the ball moves across different points in its circular path, and what forces are involved?
Why is it important for communication satellites in geostationary orbit to maintain a specific speed?