1. Friction generates heat and causes wear and tear in machinery, yet friction is often needed. Explain briefly.
2. What is the rule regarding the direction of the force of friction?
3. What is the difference between static and kinetic friction?
2. What is the rule regarding the direction of the force of friction?
3. What is the difference between static and kinetic friction?
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Answer:
1.Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
2.The direction of friction is always opposite that of motion, parallel to the surface between objects, and perpendicular to the normal force.
3.The difference between static friction and kinetic friction is that static friction acts on a body when it is at rest and kinetic friction acts on a body when it is in a state of motion. Static friction is variable while the value of kinetic friction is constant.