Question

PLEASE HELP. GRAVITY QUESTION, WRITTEN RESPONSE.
As you sit and work at your computer, list the different forces acting on your body. After listing the different forces, explain how one of Newton's laws apply to you as you are sitting and working on your computer.

Answer 1

The two forces acting on your body are the force of gravity and the normal reaction of the chair

Explanation:

As you sit on the chair, there are two forces acting on you:

- The force of gravity, acting downward, of magnitude $mg$ (where m is the mass of your body and g the acceleration of gravity)

- The normal reaction of the chair on your body, acting upward, N

We can now apply Newton's second law to this situation: this law states that the net force acting on a body is equal to the product between mass (m) and acceleration (a). Mathematically,

$\sum F = ma$

For this problem, the net force is

$\sum F = N-mg$

However, we notice that your body is at rest: so, its acceleration is zero,

$a=0$

This means that also the net force is zero:

$\sum F = 0$

And therefore,

$N-mg=0\\N=mg$

So, the normal force of the chair balances the weight of your body.

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