Question

PLEASE HELP. GRAVITY QUESTION, WRITTEN RESPONSE.

Answer 1

1) Forces acting on your body: force of gravity and normal reaction

2) Due to Newton's second law, N = mg

Explanation:

1)

When you sit on the computer, there are only two forces acting on you:

• The force of gravity, acting downward, of magnitude $W=mg$, where m is your mass and $g=9.8 m/s^2$ is the acceleration due to gravity, downward
• The normal reaction exerted by the chair on you, $N$, acting upward

Your body is in equilibrium (it doesn't move), this means that the two forces balance each other, therefore:

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

2)

We can now apply Newton's second law of motion to this situation; this law states that the net force acting on a body is equal to the product between its mass and its acceleration. Mathematically,

$\sum F = ma$

where

$\sum F$ is the net force

m is the mass

a is the acceleration

In this situation, the net force is

$\sum F = N-mg$

So the equation becomes

$N-mg=ma$

However, we observe that your body is at rest; therefore, the acceleration is zero:

a = 0

And therefore,

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

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