Question
Question: Assertion: In some situations, friction facilitates the motion and in some situations, it opposes th...
Assertion: In some situations, friction facilitates the motion and in some situations, it opposes the motion.
Reason: Friction force always opposes the relative motion between surfaces in contact.
A. Only Assertion is correct.
B. Only Reason is correct.
C. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
D. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Solution
Friction is desirable and necessary for providing traction and facilitating movement on land. For acceleration, deceleration, and changing direction, most ground vehicles rely on friction. Sudden traction loss can result in a loss of control and an accident.
Complete step by step answer:
Friction is not a basic force in and of itself. Inter-surface adhesion, surface roughness, surface deformation, and surface pollution all contribute to dry friction. Because of the intricacy of these interactions, it is impossible to calculate friction from first principles, necessitating the use of empirical methods for analysis and theory building.
Work done against friction is route dependent because friction is a non-conservative factor. Because some kinetic energy is always converted to thermal energy in the presence of friction, mechanical energy is not preserved.Friction is a force that slows you down. It is a force that resists motion directly. Friction therefore “assists” motion by slowing the item down. Friction is an opposing force to motion.
When two things come into contact, friction operates in the opposing direction of the object's motion. Friction may help or hinder an object's motion. Friction, like Newton's third law of motion, exists in pairs. One of these pair's frictional forces can assist the motion of the body on which it acts, while the other can resist it, and vice versa.
Hence option A is correct.
Note: Friction is a force that resists relative motion between surfaces that come into touch with one other. Friction is always parallel to the contact surface between surfaces and always in a direction that resists motion or attempted motion of the systems relative to each other.