Question

1. What is friction?
2.In which direction does the force of friction act?
3. Differentiate between static and sliding friction. Which is greater?
4. What kind of friction does a wheel have with the surface on which it is moving?
5. What is drag?​

Answer 1

1. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other

3. Static friction: Static friction is the friction which comes into play when surfaces of the objects are at rest relative to each other even there is an external force acted upon Sliding friction: Sliding friction is the friction which comes into play when the surface of one object moves relative to the surface of another object

4. Rolling friction is friction that acts on objects when they are rolling over a surface.

5. Drag is the aerodynamic force that opposes an aircraft's motion through the air.

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