Question

SHORT-ANSWER QUESTION:

1. What are the various units of force ?

2. Define pressure. What is the SI unit of pressure ?

3. What are the unbalanced forces ?

4. Why is a sharp knife more effective in cutting a fruit than a blunt knife?

5. Sledges are not provided with wheels. Give reasons.


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Answer 1

Answer:

1. newton- N , Dyne , kilogram force , gram force and kilopound
2. Thrust per unit area is known as pressure. The S.I unit of pressure is Pascal.
3. Forces that cause a change in the motion of an object are unbalanced forces. Unbalanced forces are not equal and opposite.
4. A sharp knife cuts objects better because due to its very thin edge, the force of our hand falls over a sharp small area of the object producing a large pressure. ... A blunt knife has a thicker edge and does not cut the object easily.
5. Sledges are not provided with wheels because while they are moving in ice wheels may protude into snow and the sledge can't move .

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