Physics
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?
Force
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Answer
(a) This a method of increasing friction as the image shows a person holding shoes with studs (spikes) at the bottom which increase their grip on the ground and hence, the friction increases.
(b) Following are the disadvantages of friction :
- Friction causes wear and tear of the rubbing surfaces. It damages the moving parts of a machine with time, tyres of vehicles and even the soles of our footwear.
- As friction produces heat, different parts of rotating machines get damaged with time and need periodic replacement. Sometimes, we need to make provisions for constant cooling of moving parts of big machines to avoid wear and tear which increases the cost of maintenance.
- Friction causes wastage of energy. We have to spend extra energy on machines to overcome friction. This decreases the efficiency of machines.
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Related Questions
The soles of the footwear have …………… to increase friction.
When the body has …………… shape, the friction is minimum.
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.
State whether the following statements are true or false. Correct the false statements.
(a) Force can change the shape and size of an object.
(b) Collision force is a non-contact force.
(c) Friction does not depend on weight of a body.
(d) Lubricating is a method used to increase friction.
(e) Presence of grooves in soles makes it easier to walk.