Why do we need friction?

Answer 1

Friction is necessary for walking due to the following reason, As per Newton's third law of motion, (every action has an equal and opposite reaction) we can walk if and only if the ground we are walking on push our feet back with a force. Now, as per the third law the ground would definitely push our feet back but if we are walking on a perfectly smooth ground which has no friction our force would simply cancel out the force reverted by the ground and we would fall.

Answer 2

If there was no friction, your foot would simply slide back as you tried to take steps, and you would go nowhere.

In order for something to move, it has to have a force moving it. That force has to have leverage, or friction. For the force pushing a person forward, there is an equal force pushing backward on the ground or floor. You can observe this by placing round pencils under a board, stand on it, and try to step off in the perpendicular direction : the board will roll backward as you step forward.

Answer 3

Friction is the force that resists movement between surfaces that are just touching.

If you're walking, it's the friction between your feet and the floor that keeps your foot in place so that you can push off against it and move forward.

Without friction, the simplest every day tasks - walking, sitting down, opening a door - would be impossble - or close to it, just depending on what it is. If we didn't have friction, we'd take an eternity just to screw a lightbulb in - if we ever got the task done at all.

Entirely without friction, even the slightest draught would move your furniture across the room.

There's actually a video of an experiment that took place in space - the task was to construct something (I want to say jetpack for some reason) in the airless, frictionless space. Two hours later he didn't have the thing anywhere close to finished, and he was sweating, out of breath. He couldn't even move the screwdriver (or whatever he used) without turning with it.

Answer 4

so it can make it hard 2 move the objects

ex: Bowling ball

we can not drive a car or change the direction,

we can't walk on floor

Answer 5

By the change of velocity when you walk or run. It opposes motion between two surfaces ( which this time are your feet and the surface where you are walking or running ) that are touching.

Answer 6

we need friction for the simple necessities like walk, run, and swim...

Answer 7

It keeps them to the ground.

Answer 8

Yes.