MIND MAP
Advantages Disadvantages
Prevents from slipping
Definition Wear and tear of objects
Stops a moving vehicle
Heat is generated
Enables us to walk Type of force that opposes the
wastage of energy
motion of an object
FRICTION
Ways to increase
Types Ways to reduce
friction Static friction friction
Sliding friction
Smoothening the
increasing the roughness of Rolling friction
surface in contact
surface in contact
Static friction > sliding friction Applying oil, grease
changing the shape of object
or wax
increasing the weight of object >rolling friction
Using ball bearings,
wheels, air cushions
, EXPLANATION
Friction: When one surface moves over another surface, a force comes into play and opposes
their relative motion. This force is called friction or force of friction.
Friction always opposes motion because it acts in the opposite direction to motion.
Force of friction arises due to contact between the two surfaces. If there is no contact
between the two surfaces, there would be no friction.
All types of surface like solid, liquid and air offer the force of friction.
Example:
(a) A moving wheel on the ground stops after covering a certain distance because surface
of ground offers friction in the opposite direction of motion.
(b) Gently push a ball on a table. It stops after moving for some distance because of
friction between the surfaces of ball and table.
Factors Affecting Friction:
Nature of surfaces in contact : Friction is created because of irregularities on the surfaces. The
irregularities on surfaces result in interlocking of the two surfaces. The interlocking between two
surfaces creates friction. Hence, the force of friction will be greater in case of rough surface than
in case of smooth surface.
Surface irregularities
Advantages Disadvantages
Prevents from slipping
Definition Wear and tear of objects
Stops a moving vehicle
Heat is generated
Enables us to walk Type of force that opposes the
wastage of energy
motion of an object
FRICTION
Ways to increase
Types Ways to reduce
friction Static friction friction
Sliding friction
Smoothening the
increasing the roughness of Rolling friction
surface in contact
surface in contact
Static friction > sliding friction Applying oil, grease
changing the shape of object
or wax
increasing the weight of object >rolling friction
Using ball bearings,
wheels, air cushions
, EXPLANATION
Friction: When one surface moves over another surface, a force comes into play and opposes
their relative motion. This force is called friction or force of friction.
Friction always opposes motion because it acts in the opposite direction to motion.
Force of friction arises due to contact between the two surfaces. If there is no contact
between the two surfaces, there would be no friction.
All types of surface like solid, liquid and air offer the force of friction.
Example:
(a) A moving wheel on the ground stops after covering a certain distance because surface
of ground offers friction in the opposite direction of motion.
(b) Gently push a ball on a table. It stops after moving for some distance because of
friction between the surfaces of ball and table.
Factors Affecting Friction:
Nature of surfaces in contact : Friction is created because of irregularities on the surfaces. The
irregularities on surfaces result in interlocking of the two surfaces. The interlocking between two
surfaces creates friction. Hence, the force of friction will be greater in case of rough surface than
in case of smooth surface.
Surface irregularities
