What is the weight of a 19kg stone?

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The weight of a 19 kg stone is calculated using the formula weight = mg, resulting in approximately 186 Newtons, not kilograms. For part B, to raise the stone without acceleration, the force required equals the weight, which is 186 Newtons. It's important to note that kilograms measure mass, while Newtons measure weight. The discussion emphasizes the need to apply Newton's laws correctly, particularly that an object at constant speed requires a net force equal to its weight. Understanding these principles is crucial for solving the problem accurately.
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Homework Statement


a)What is the weight of a 19kg stone?
b)what force if required to raise the stone without acceleration.

Homework Equations


weight=mg
Fnet=ma

The Attempt at a Solution


A)9.8N/kg*19kg
=186kg
B)didnt get how to this part
 
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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.
 
is the answer to Part B gravity
 
Whats Newton's first law?
 
is it inertia
 
Newton's first law states that an object will remain stationary or at uniform velocity if no net force acts upon it.
 
so for part B the answer is that the net force must raise it
 
Yes in a manner. But its a little more complicated.
 
do i have to do any calculations for the anser
 
  • #10
soulja101 said:

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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