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What is the weight of a 19kg stone?

  • Thread starter soulja101
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1. Homework Statement
a)What is the weight of a 19kg stone?
b)what force if required to raise the stone without acceleration.

2. Homework Equations
weight=mg
Fnet=ma

3. The Attempt at a Solution
A)9.8N/kg*19kg
=186kg
B)didnt get how to this part
 

Answers and Replies

Kurdt
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Part a) is correct apart from the units.

Part b) what do you know of Newton's laws? I think you have to neglect the initial acceleration and consider the stone being raised at a constant speed.
 
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is the answer to Part B gravity
 
Kurdt
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Whats Newton's first law?
 
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is it inertia
 
Kurdt
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Newton's first law states that an object will remain stationary or at uniform velocity if no net force acts upon it.
 
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so for part B the answer is that the net force must raise it
 
Kurdt
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Yes in a manner. But its a little more complicated.
 
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do i have to do any calculations for the anser
 
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3. The Attempt at a Solution
A)9.8N/kg*19kg
=186kg
B)didnt get how to this part
Not to be picky:biggrin: but grams and kilograms are not a measurment of weight, they are a measurment of mass. Also newtons second law is F=ma. 19kilograms is right but if i'm correct you should have 9.8m/s not N/kg. Lastly:biggrin: 9.8m/s*19kg would equal 186 newtons, or just about 41 pounds.

hope i helped
 

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