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The Adventures of Dr. Force by Briana17 on 10-16-2011
The second law of motion allows us to define the unit of force. The unit of mass is kilogram and the unit of acceleration is meter/second/second. When multiplied, they become the unit Newton (N).
Isaac Newton came up with his own laws and he has his own unit of measurement? That's pretty cool.
Try to focus. Let's say we wanted to know what force is needed to accelerate a 200-kg vehicle at +4.00 m/s/s. We would plug these numbers into F=ma and solve.
We would get 800 N.
Excellent. At this pace, you may become the next Isaac Newton. We can also use the second law to calculate weight. Weight equals mass times gravity. We can use the constant 9.80 meter/second/second for gravity on Earth.
That's pretty simple. Newton would be the unit for weight since we are multiplying kilogram by meter/second^2. We should be able to solve for any variable in the formulas W=mg and F=ma if we know two of the variables.
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