28. What is the cause of friction? How can we reduce the amount frictional force? Write your views
whether friction is useful or not?
Answers
Answer:
Friction is a force that resists the relative motion between two objects or materials. The causes of the resistive force of friction are: Molecular Adhesion. surface roughness . Methods for decreasing friction:
Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
Lubrication is another way to make a surface smoother. ...
Make the object more streamlined. ...
Reduce the forces acting on the surfaces. ...
Reduce the contact between the surfaces. Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding. Sometimes we want to reduce friction.