Question

(3 marks each)
11. Define friction, static friction and limiting friction. Which of them is self-adjusting force of friction?
12. Differentiate ‘sin x' by ab initio method.​

Answer 1

Answer:

Static friction is a self - adjusting force because it comes into play when

the body is lying over the surface of another body without any motion.

If we have not applied any force on a body to move the body,

the frictional force also becomes zero.

If we start applying force,

with the applied force,

the frictional force also starts increasing.

This happens until the applied force is less than limiting frictional force.

When that body overcomes the force of static friction,

the maximum value of static friction is reached -which is known as limiting friction.

After the limiting friction,

the frictional force is not going to increase further.

At this stage,

the object moves overcoming the frictional force which is at a constant value.