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WEEK 4
TOPIC: FORCES
SUB-TOPIC: Friction
Meaning of Friction:
The force that tries to stop a body from moving is called friction. Friction also means force that opposes motion. Friction can be reduced by lubrication i.e. adding oil and grease placed between the two surfaces in contact. The oil and grease are called lubricants.
Protection from Friction
Friction is a force that occurs when one object moves against another. The ceramic tiles on the outside of the space shuttle protect it from the great friction caused when the shuttle re-enters Earth’s atmosphere.
Uses and advantages of friction
- It enables us to walk and run without slippery
- It enables us to sharpen knives and cutting tools
- It is a useful force when we tie shoe lace
- It is a useful force when we strike a match or sit on a chair
- Screw, nails, bolt and nuts rely on friction to prevent them from working loose.
- Friction is a useful force in belt drive and clutches on machinery, as it allows energy to be transferred.
- Friction makes cars to move on the road. The tyres of a car have rough surfaces so that when the engine of the car makes the wheels go round, they grip on the surface of the road. If tyres and roads were so smooth there will be no friction between them, the car would not move.
Disadvantages of frictions
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