- Introduction
- Rest time! Have fun
- Physics
- Chemistry
- BIOLOGY
- Reaching the age of Adolescence
- CROP PRODUCTION AND MANAGMENT
- Cells : The basic structural unit of life
- Nutrition in human beigns
- RESPIRATION IN HUMAN BEIGNS
- TRANSPORTATION IN HUMAN BEIGNS
- excretory system in human beigns
- NERVOUS SYSTEM
- PHOTOSYNTHESIS
- Respiration in plants
- REPRODUCTION IN PLANTS
- MOVEMENTS IN PLANTS
- Forest our lifeline
- WASTE WATER STORY
- WEATHER,CLIMATE AND ITS ADAPTATION .
- Reaching the age of Adolescence
- Model tests
- Animation time
Friction
Friction-
-It is a contact force.
- It opposes relative motion.
Charecterstics
- It is independent of area in contact.
- It's maximum value is net force applied on it .
- It depends on type and condition of surface in contact.
Causes of friction
Friction is caused because of inter-molecular forces between two surfaces which are coming in contact when there is less area in contact pressure in lmore so inter-molecular forces between them is more.
According to old view friction is caused by irregularities between the surfaces.
Effects of friction
1. It produces heat.
2. It causes wear and tear.
Types of Friction
1. Static friction-
It is the friction between two bodies in contact when there is no relative motion. Its maximum value is net force applied on body.
2. Limiting friction-
It is maximum value of static friction which comes in picture when two bodies are going to slide on each other.
3. Kinetic friction-
It is a type of friction between two bodies which has relative motion.
4. Rolling friction-
It is the friction in which a body rolls on other .
" FRICTION IS A NECESSARY EVIL"
Friction is a necessary evil because it has advantages as well as disadvantages.
ADVANTAGES OF FRICTION
Because of friction we can stand on land . Sometimes when we feel cold we rub our hands to get freed from cold.
Disadvantages of friction
It causes wear and tear in machines .
It is difficult to walk in places which has more friction.
-It is a contact force.
- It opposes relative motion.
Charecterstics
- It is independent of area in contact.
- It's maximum value is net force applied on it .
- It depends on type and condition of surface in contact.
Causes of friction
Friction is caused because of inter-molecular forces between two surfaces which are coming in contact when there is less area in contact pressure in lmore so inter-molecular forces between them is more.
According to old view friction is caused by irregularities between the surfaces.
Effects of friction
1. It produces heat.
2. It causes wear and tear.
Types of Friction
1. Static friction-
It is the friction between two bodies in contact when there is no relative motion. Its maximum value is net force applied on body.
2. Limiting friction-
It is maximum value of static friction which comes in picture when two bodies are going to slide on each other.
3. Kinetic friction-
It is a type of friction between two bodies which has relative motion.
4. Rolling friction-
It is the friction in which a body rolls on other .
" FRICTION IS A NECESSARY EVIL"
Friction is a necessary evil because it has advantages as well as disadvantages.
ADVANTAGES OF FRICTION
Because of friction we can stand on land . Sometimes when we feel cold we rub our hands to get freed from cold.
Disadvantages of friction
It causes wear and tear in machines .
It is difficult to walk in places which has more friction.