Why do we need to increase friction?

The soles of the footwear have …………… to increase friction.

Observe the given image and answer the following questions.

(a) Is this a method of increasing or decreasing friction?

(b) What are the disadvantages of friction?

Fill in the blanks.

(a) …………… is a push or pull acting on a body that changes the motion of an object.

(b) Force applied does not change the …………… of an object.

(c) …………… and …………… are the two types of unbalanced forces.

(d) Sliding friction is …………… than rolling friction.

(e) Friction is caused due to …………… on the surface of objects.