Conceptual Questions Chapter 5 Rotational and Circular Motion l First Year Physics KPK Syllabus

Give a short response to the following questions 1. Why is the fly wheel of an engine made heavy in the rim? 2. Why is a rifle barrel rifled? 3. Is it possible for a person to distinguish between a raw egg and a hard boiled one by spinning each on a table? Explain. 4. Why is the acceleration of a body moving uniformly in a circle, directed towards the centre? 5. A ball is just supported by a string without breaking. If it is set swinging, it breaks. Why? 6. An insect is sitting close to the axis of a wheel. If the friction between the insect and the wheel is very small, describe the motion of the insect when the wheel starts rotating. 7. Explain how many minimum number of geo-stationary satellites are required for global coverage of T.V transmission. 8. Explain the significance of moment of inertia in rotatory motion. 9. Why does the coasting rotating system slow down as water drops into the beaker? 10. A body will be weightless when the elevator falls down just like a free falling body. Explain? 11. When a tractor moves with a uniform velocity, its heavier wheel rotates slowly then its lighter wheel, why? Explain.