Question

Which of the following activities would not be possible in the absence of friction?

A. Holding a glass
B. Writing on a paper
C. Sitting on a chair
D. All of the above

Answer 1

Hint: In order to know the exact answer, we need to understand the concept of friction. Friction is a force between two surfaces that are sliding, or trying to slide, across each other or Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other

Step by step answer: Friction plays a vital role in our daily life. Without friction we cannot even do any work. It always resists the motion, so extra energy is required to overcome it.

As above options, holding a glass, writing on a paper and sitting on a chair needs frictional force otherwise we cannot even do anything in our daily life. Without frictional force we cannot hold a glass, cannot sit on a chair and cannot write on paper.
 Similarly we can see some more examples of how frictional force exists everywhere in all the cases. It becomes difficult to walk on a slippery road due to low friction. When we move on ice, it becomes difficult to walk due to low friction of ice.
We cannot fix nails in the wood or wall if there is no friction. It is friction which holds the nail.
So, none of the above activities are possible without friction.

Hence option D is correct, that is all of the above.

Note: Although friction is not one of the four basic forces of nature, it exists because those basic forces exist. Friction is the resistance to motion of two objects held against each other. Some friction is caused by molecular attraction, such as when Vibram soles are able to maintain grip on smooth rock.