Question

38. Explain various types of friction.

Answer 1

Answer:

There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases.

Answer 2

Answer:

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First let's know what is friction or frictional force.

Friction or frictional force that acts between the surfaces of objects in contact and opposes the movement of ome surface against the other.

Frictional force acts on objects whose surfaces are in contact with each other. If an object moves over another one, friction acts in the direction opposite to the direction of motion.

Now, let's know about the types of friction.

There are three types of friction -

• Static friction: The frictional force that acts between two objects are in contact and at rest is called static friction. When we apply a force to slide a book on a table, the book does not slide if the force applied is less that the friction. But if we increase the applied force, the book will be at rest just about to slide. The maximum frictional force that opposes this movement is static friction.
• Sliding friction: The force of friction that acts between two objects in contact when one object slides over the surface of the other is called sliding friction. Sliding friction is equal to the force needed to keep the object moving. Sliding friction is less than static friction.
• Rolling friction: The force of friction that opposes the motion of an object that rolls over the surface of another is called rolling friction. Rolling friction is less than sliding friction. This is why wheels and rolllers are used to move heavy objects such as furniture and luggage from place to place.

Note!

For and object, static friction is greater than sliding friction, and sliding friction is greater than rolling friction.

Hope it helps you! ❤