1. Define Friction.
2. What is the direction of friction force ?
3. Friction is considered as necessary Evil. Why?
4. Is friction force is a contact force ?
5. What is provided between two surfaces to make movement smooth?
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Answers
Answer:
1. Friction is the resistance to motion of one object moving relative to another.
2. it is in a direction parallel to the plane of the interface between objects. Friction always acts to oppose any relative motion between surfaces.
3. Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil.
4. There is always a field linked with non-contact force. The frictional force is an example of a contact force.
5. Lubricants
Explanation:
1. Friction is the resistance to motion of one object moving relative to another.
2. The frictional force is the other component; it is in a direction parallel to the plane of the interface between objects. Friction always acts to oppose any relative motion between surfaces.
3. Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. ... But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil.
4. Contact forces are often decomposed into orthogonal components, one perpendicular to the surface(s) in contact called the normal force, and one parallel to the surface(s) in contact, called the friction force.
5. That is GRAVITY and FORCE.