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Old Sep 15th 2008, 05:00 PM   #1
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Newton's 2nd law

Hello everyone,

Could someone please tell me if this looks right?

If an object has a mass of 200g and the net force is 5.0N, what is the acceleration?

5N=200ga
a=.025N/g

Acceleration is normally in m/s^2, right? Could you please show me how to convert it?

Thank you very much
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Old Sep 15th 2008, 05:21 PM   #2
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Originally Posted by chocolatelover View Post
Hello everyone,

Could someone please tell me if this looks right?

If an object has a mass of 200g and the net force is 5.0N, what is the acceleration?

5N=200ga
a=.025N/g

Acceleration is normally in m/s^2, right? Could you please show me how to convert it?

Thank you very much
First you need to get the mass into kg, not g. So the first line should read
$\displaystyle 5~N = (0.200~kg)a$

$\displaystyle a = \frac{5~N}{0.200~kg} = 25~N/kg$

So now for the unit. We know that $\displaystyle 1~N = 1~kg~m/s^2$. Thus
$\displaystyle \frac{N}{kg} = \frac{kg~m/s^2}{kg} = m/s^2$

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