Which of these is not true about friction? a, Friction tends to stop a moving object. b, Friction tends to stop a stationery objects from moving. c, Friction act in the direction opposite to the direction of motion. d, Friction always helps motion.
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The statement that is not true is, Friction always helps in motion
[Option D]
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- We know that friction is always an opposing force and always opposes the force we apply
- Frictional force act's in opposite to our force so which means it tends to stop a moving body
- Friction is the bonds that happen between particles and unless we apply a force greater than the frictional force we can't move a body
- Rougher the surface more will be the friction.
- Places like on ice (Antartica) the surface will be soo smooth so the friction will be very low
- You might have observed that we have grips on tyres. This helps us in increasing the friction and hence increasing the grip between the tyre and the road which avoids accidents
- Similar things are used in shoe grips and as the grip is reduced the frictional force will be reduced
- Frictional force is given by the product of the coefficient of friction and the normal force
- F = μN
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