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  • Friction can be increased by  Option: 1 Using air cushionOption: 2 Lubricants</

Friction can be increased by
 

Option: 1

Using air cushion


Option: 2

Lubricants


Option: 3

Using sand

 


Option: 4

Using ball bearings


Answers (1)

best_answer

 

 

Static Friction -

  1. It occurs when there is a tendency of relative motion, i.e, the body is still at rest and is just about to move.

  2. When two bodies do not slip over each other, then the force of friction is called static friction.

  3. It is a variable force or self-adjusting force as it changes itself according to the applied force.

  4. It is denoted by fs and the static friction is in between:- 0< f_{s}< f_{l}

where fl is limiting friction.

5.    Limiting friction is the maximum static friction that a body can exert on the other body in contact with

It and is given by:-

F_{l}\;\alpha\ R  or   f_{l}=\mu_{s}R

f_{l}= limiting friction 

\mu_{s}= coefficient of friction

R = reaction force

6.    Generally,

f_{K}<F_{l}

\therefore\ \mu_{K}<\mu_{s}

So,

On rainy days, we throw sand on the slippery ground. This increases the friction between our feet and the ground and reduces the chance of slipping.

Posted by

Nehul

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