1. When a body slides over smooth and wet surfaces.
the amount of interlocking of irregularities of the two
surfaces in contact, increases
2. If a car moves eastwards, the force of friction acts
southwards
3
Friction depends on how hard the two surfaces press
against each other
The sole of shoes and the tyres of the vehicles are
treaded' to decrease the effects of friction.
5. Lubricants can be liquids, semi-liquids or solids
Friction can be increased by using ball bearings
between the moving parts of machines.
6
Answers
Answer:
1) Friction is created because of irregularities on surfaces. The irregularities on surfaces result in interlocking of two surfaces. The interlocking between two surfaces creates friction. Hence, the force of friction will be greater in case of rough surface than in case of smooth surface.
2) No, if a car moves eastward the force of friction acts westward i.e. in the opposite direction of the movement.
3) Friction greatly depends upon the nature of the surfaces when they are pressed against each other i-e. either the surface is smooth or rough. If the surface is smooth, less amount of force is required to move the two surfaces, hence friction will be less.
4) The sole of shoes and the tyres of the vehicles are treaded to decrease the effect of friction. ... <br> Reason : The necessary centripetal force is provided by the force of friction between the tyres and the road.
Answer:
If a car moves eastwards, the force of friction acts southwards.______ 3. Friction depends on how hard the two surfaces press against each ...