Worksheets for Class-VIII SCIENCE TOPIC: Force and Pressure |
1. Name the force used in removing iron scrap from a heap of mixed scrap. |
2. When is the pressure on the ground more – when a man is lying or when a man is standing? Explain. |
3. You can fill a bucket from a downstairs tap quicker than from an upstairs tap. Why? |
4. Why do mountaineers suffer from nose bleeding at high altitudes? |
5. Trucks and buses have double tyres in the rear end. Why? |
6. Why do deep-sea divers have to wear special suits before going for diving at the depths? |
7. Why is it easier to hammer a sharp nail into the wood than a blunt one? |
8. Why does a balloon stick to the wall after it is rubbed on polythene? |
9. State the type of force acting in the following conditions- |
(a) Lifting a school bag. |
(b) Bullocks ploughing the field |
(c) Attraction of paper bits towards a comb. |
(d) Attraction of iron nails towards a magnet. |
(e) Stopping a goal by a goalkeeper. |
(f) Coming downwards of the object even when it is thrown upwards. |
10.An elephant weighing 50,000 Newton stands on one foot of area 1000cm2 . What is the Pressure exerted on the ground? |
11.A drawing pin is pushed against a wooden table with a force of 10 N. Calculate pressure exerted on the ground by the person, when he is standing. |
12.Give reasons- |
(a) Buildings have wide foundations. |
(b) It is easier to hold a school bag with wide straps than the one with thin strings. |
(c) A bottle gets crushed when all its air is removed. |
13. (a) State the relation between pressure exerted and area of the surface. |
(b) State and define the unit of pressure. |
14. How is gravity different from gravitational force? |
15. How much force should be applied on a100cm2 area using pressure of 25 Pascal? |
16. Fill in the blanks |
(a) S.I unit of pressure is ____________. |
(b) The amount or the strength of force is called its_______________. |
(c) Pressure in solid depends upon ________________ and ____________. |
(d) Pressure in liquids depends upon _____________ and ______________. |
(e) Force generated by moving of non living materials is called ______________. |
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15 September 2012
Worksheets for Class-VIII SCIENCE TOPIC: Force and Pressure
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