i'm doing a physics planning exercise, and i need to find the how stress is affected by an angle.....?

Question

what should the mass of my weights be and what size newton meter (measures force) should i use. The planning i am doing is to create a bridge like structure. Please help!! Thanks

Answer 1

I think you are referring to a torque or moment (angular force)
T=r x F or
T= r x W

W=mg

T -torque (meter Newtons)
r - the arm
W - weight of the weights
m -mass of the weights
g - 9.81m/s^2

also there a reason a reason why I put down T= r x F
both r and F are vectors and 'x' designates a vector product
We can also write

T=|r||F| sin(a)
A- angle between r and F (so only the perpendicular to the arm component of force F is a contributor to the torque)

The question you have posted is not clear; however you have enough information to design your experiment. If not let me know.