Friction

GOVT. SR. SEC. SCHOOL(B) PHILLOUR Project made by Sh. Hari Krishan

PROJECT ON FRICTION • •

Teacher involved:Ajmer singh Teacher trainer:Deepak Salhan

• • • • •

Student’s involved:Kulwant Singh Satwant Singh Varinder Singh Massa Singh

• Student trainer:Ravideep Randhawa Mohan Lal

WHAT IS FRICTION?

Friction, force that opposes the motion of an object when the object is in contact with another object or surface.

How friction occurs? Friction results from two surfaces rubbing against each other or moving relative to one another It can hinder the motion of an object or prevent an object from moving at all .

CAUSES OF FRICTION Friction occurs in part because rough surfaces tend to catch on one another as they slide past each other. Even surfaces that are apparently smooth can be rough at the microscopic level. They have many ridges and grooves. The ridges of each surface can get stuck in the grooves of the other, effectively creating a type of mechanical bond, or glue, between the surfaces.

KINDS OF FRICTION • • • •

Static friction Sliding friction Rolling friction Fluid friction

Static friction Static friction prevents an object from moving against a surface. It is the force that keeps a book from sliding off a desk, even when the desk is slightly tilted, and that allows you to pick up an object without the object slipping through your finger

Sliding friction A book sliding off a desk or brakes slowing down a wheel are both examples of sliding friction, also called kinetic friction. Sliding friction acts in the direction opposite the direction of motion

Rolling friction Rolling friction hinders the motion of an object rolling along a surface. Rolling friction slows down a ball rolling on a basketball court or softball field, and it slows down the motion of a tire rolling along the ground

Fluid friction Objects moving through a fluid experience fluid friction, or drag. Drag acts between the object and the fluid and hinders the motion of the object

EFFECTS OF FRICTION Friction helps people convert one form of motion into another. For example, when people walk, friction allows them to convert a push backward along the ground into forward motion. Similarly, when car or bicycle tires push backward along the ground, friction with the ground makes the tires roll forward. Friction allows us to push and slide objects along the ground without our shoes slipping along the ground in the opposite direction.