[3 Mark Question Answer]

Question 13 Marks

Across
3. The force of friction caused due to fluids
4. Type of friction acting between two bodies at rest
5. ‘type of friction which occurs when applied force overcomes static friction
6. A special body design to enable minimum drage
Down
1. type of force which depends upon the roughness of a surface
2. An effect of friction

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Question 23 Marks

Describe three different ways by which friction can be increased to help us in various situations.

Answer

Ways by which friction can be increased are :

Tyres of all vehicles have grooved designs or treads to make their surface rough. Roughness of a surface increases friction and prevents vehicle from slipping or skidding on a wet or muddy road.
Spikes in the shoe soles used by players and athletes increase friction and they get firm grip on the ground. The soles of footwear are also provided with grooved designs to increase friction and avoid slipping.
The handles of motorbikes are covered with spiked rubber to provide a good grip and have better control in holding the handies.

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Question 33 Marks

Define friction and explain how it is useful to us.

Answer

Friction is a force that opposes relative motion between two bodies/surfaces in contact with each other. Although friction opposes motion, it also makes motion possible. Friction helps us do many things like :

It helps us in walking. In the absence of friction, we may slip or fall.
Cars and buses are able to move safely on roads due to the friction between the treaded tyres of these vehicles and the surface of the road.
Friction allows us to hold objects with our hands.
It allows us to write on a paper.
Friction produces heat. In winter, when we rub our cold hands, the heat produced due to friction makes our hands warm.

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PHYSICS [3 Mark Question Answer]

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