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```        Sir,
I have a query?
Can you tell me which is the direction of static friction acting on us when we do run over a treadmill when
a) we are at rest with respect to ground
b) we are accelerating with respect to ground either in forward or in backward direction of our run.```
7 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear siddharth,

Static friction is the friction experienced when we try to move a  stationary body on a surface, without actually causing any relative  motion between the body and the surface which it is on.
It can be defined as the force of friction which exactly balances the applied force during the stationary state of the body.
Static frictional force is a self-adjusting force. i.e., the static  friction will always be equal and opposite to the force applied.

Consider the figure, R is the reaction force due to the weight W. fr is the friction and F the external force. F = -fr when no motion occurs.
Laws of static friction

The maximum force of static friction is independent of the area of contact.

The maximum force of static friction is proportional to the normal  force i.e., if the normal force increases, the maximum external force  that the body can withstand without moving, also increases.

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.

Sagar Singh
B.Tech IIT Delhi

```
7 years ago
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