Friction
Definition
Friction is a force that opposes motion between two surfaces in contact with each other. It is a type of contact force that arises from the interaction between the surfaces of two objects.
Learning Outcomes:
To define friction.
To understand types of friction
To study about factors affecting friction.
To know the methods for reducing friction.
The E - content video is below:
Note
Friction is a force that opposes motion between two surfaces in contact.
It helps us to walk, run, and stop without slipping.
There are two types of Friction:
Rolling Friction: Opposes motion when an object rolls on a surface.
Sliding friction:Opposes motion when an object slides on the surface.
Factors Affecting Friction:
Surface Roughness: Rougher surfaces have more friction.
Importance of Friction
Helps us to walk and run without slipping.
Essential for braking systems in vehicles.
Helps us to hold objects in our hands.
Ways to Reduce Friction
Lubricants: Oils and greases can reduce friction.
Smooth Surfaces: Smoother surfaces can reduce friction.
Wheels and Ball Bearings: Can reduce friction by allowing objects to roll instead of slide.
Assessment:
1) What is the force that opposes motion between two surfaces in contact called?
a) Gravity
b) Friction
c) Magnetism
d) Electricity
2)Distinguish types of friction.
3)How can we reduce friction?
4)Name some lubricants.
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