Question

Part B Identify and draw the forces that act on the pencil. Be certain to draw each force at the correct location (the point at which the force acts on the pencil). The black dot represents the center of gravity of the pencil. Draw the vectors starting at the points where the forces act on the pencil. The location and orientation of the vectors will be graded. The length of the vectors will not be graded.

THERE ARE ONLY 2 VECTORS, NORMAL FORCE AND WEIGHT

Answer 1

Concepts and reason

The concept is used to solve this problem is to free body diagram, frictional force, normal force.

First check the object if the object is contact with the surface then a frictional force is act on the object and if an object is stand without any inclination then weight force is counter by the weight force.

Fundamentals

Write the expression for the normal force.

$N = mg$

Here, $N$ is the normal force, $m$ is the mass of the object and $g$ is the acceleration due to the gravity.

Write the expression for the friction force.

${f_k} = \mu N$

Here, ${f_k}$ is the friction force, $\mu$ is the friction coefficient and $N$ is the normal force.

Draw the provided diagram for the pencil.

The free body diagram for the pencil is as shows below:

Here $N$ is the normal force, ${F_a}$ is the applied force and ${F_r}$ is the friction force.

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Ans:

Consider the free body diagram of the pencil as,