Question

1. We can change the speed and director of a moving body by

applying._____

2. S.I unit of pressure is _____.

3. _____ exert pressure in all directions.

4. If area over which the force acts decreases, the pressure ____

II. Answer the following 6M

5. Why the cutting edge of a knife should be sharp as possible?

6. Give two examples of situation in which applied force causes a

change in the shape of an object?

7. Why is it difficult to walk on a sandy floor with pencil heels?​

Answer 1

Answer:

1. Applying force
2. Pascal
3. liquid
4. increases

II

1. The edge of a knife should be sharp because it needs to cut the object, it exerts pressure on the object which needs to be cut. But a blunt knife cannot do this thing.
2. (I) A potter making a pot. (ii) Crushing a bottle
3. It is difficult to walk on sand with pencil heels because the particles of sand are loosely packed, whereas the heels have less area at the bottom. Therefore heels exert more pressure on sand and it is difficult to walk on them.

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Answer 2

The answer to the given questions are:

1. We can change the speed and director of a moving body by  applying FORCE.

2. S.I unit of pressure is PASCAL (Pa).

3. FLUIDS exert pressure in all directions.

4. If area over which the force acts decreases, the pressure INCREASES.

II

5. The cutting edge of a knife should be sharp to reduce its surface area so that it will exert more pressure on the object which needs to be cut and makes cutting easy.

6. A change in the shape of an object is caused by:

(i) Crushing of can.

(ii) Cutting of vegetable.

7. It is so because the area of pencil heels is very less and due to this they exert more pressure on loosely held sand particles.

- It causes the heels to pierce into the sand and it becomes difficult to walk in such situation.