Question

how to calculate weight of a:
5kg mass

Answer 1

weight is just the force exerted on an object due to gravity. Since your mass is given in kg, the common convention would be to use 9.81m/s^2 as the acceleration due to gravity at the surface of the earth. F = m * g where g is the acceleration due to gravity and F is the weight force

F = 5kg * 9.81 m/s^2

Answer 2

= 49.05 Newtons

Answer 3

thank you, but I don't understand where 9.81 comes from?

Answer 4

F = mg

Answer 5

could you please elaborate?

Answer 6

At different points on Earth, objects fall with an acceleration between 9.78 and 9.82 m/s2 depending on altitude, with a conventional standard value of exactly 9.80665 m/s2 (wikipedia)

essentially there are lots of scientists who have looked at how things fall and how they accelerate, and they have calculated things to accelerate at 9.80665... or about 9.81 m/s^2

since force = mass * acceleration, you take this acceleration due to gravity and multiply it by mass to find the force due to gravity AKA weight.

lemme know if youre still confused about anything

Answer 7

I completely understand, thank you so much.