Login
Home
TOP
Send feedback
Login
Subjects
Physics CBSE Live product
Class 8 (2026-27)
Exploring Forces
Contact forces
9.
Fundamentals of friction
Question:
5
m.
Choose the correct answer
:
1
.
Which statement gives the most accurate definition of friction?
Friction is a force that acts only when objects move freely without resistance
Friction is a force that acts even when objects are not touching
Friction is a force that opposes the motion or attempted motion between two surfaces in contact
Friction is a force that supports motion by acting along the direction of movement
2
.
Why does friction always act opposite to the direction of motion or attempted motion?
Friction balances the gravitational force
Friction depends on the shape of the object
Friction resists relative motion between two surfaces in contact
Friction supports the motion of an object
3
.
Why does friction exist even between surfaces that appear smooth?
Smooth surfaces are completely free from irregularities
Friction is caused by air trapped between smooth surfaces
Even smooth-looking surfaces have microscopic irregularities
Smooth surfaces produce friction only under heavy pressure
Login
or
Fast registration
Previous task
Exit to the topic
Next topic
Send feedback
Did you find an error?
Send it to us!
