Friction plays an important role while writing. If there is no friction between paper and pen then the pen will slip off from the paper and it will not be possible to write on the paper. Also, friction helps us to grasp the pen/pencil. Thus, friction is necessary while writing.
GRAVITY
Running
A number of daily life activities involve the application of gravitational force.
When running upright, gravity pulls straight down on the body. This does not help the forward linear motion the runner is trying to achieve. However, running with a lean allows gravity to pull the runner forward.
Answers & Comments
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Explanation:
FRICTION
Writing in a notebook/ paper
Friction plays an important role while writing. If there is no friction between paper and pen then the pen will slip off from the paper and it will not be possible to write on the paper. Also, friction helps us to grasp the pen/pencil. Thus, friction is necessary while writing.
GRAVITY
Running
A number of daily life activities involve the application of gravitational force.
When running upright, gravity pulls straight down on the body. This does not help the forward linear motion the runner is trying to achieve. However, running with a lean allows gravity to pull the runner forward.