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Physics CBSE Live product
Class 8 (2025-26)
Exploring forces
Revision I - Exploring forces
9.
Fundamentals of friction
Question:
5
m.
Choose the right answer below
:
1
.
Why is friction called a contact force?
Because it acts due to gravitational attraction between objects
Because it acts through air without any physical contact
Because it depends on the mass of the objects involved
Because it arises only when two surfaces are in direct contact
2
.
What is the main cause of friction between two solid surfaces?
Chemical reactions occurring between the surfaces
Heating effect produced due to motion
Interlocking of microscopic irregularities on the surfaces
Gravitational force acting on the objects
3
.
Why does friction exist even between surfaces that appear smooth?
Even smooth-looking surfaces have microscopic irregularities
Smooth surfaces are completely free from irregularities
Smooth surfaces produce friction only under heavy pressure
Friction is caused by air trapped between smooth surfaces
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