# What is the weight of a 19kg stone?

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

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Kurdt
Staff Emeritus
Gold Member
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

Kurdt
Staff Emeritus
Gold Member
Whats Newton's first law?

is it inertia

Kurdt
Staff Emeritus
Gold Member
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

Kurdt
Staff Emeritus
Gold Member
Yes in a manner. But its a little more complicated.

do i have to do any calculations for the anser

3. The Attempt at a Solution
A)9.8N/kg*19kg
=186kg
B)didnt get how to this part
Not to be picky 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 9.8m/s*19kg would equal 186 newtons, or just about 41 pounds.

hope i helped