View Full Version : Physics answer!
ssfire
Dec 6, 2007, 04:04 PM
A board that is 1.5 m long is supported in two places. If the force exerted by the first support is 25N and the force exerted by the second is 62N, what is the mass of the board?
Capuchin
Dec 6, 2007, 04:09 PM
I assume that the whole system is at rest.
If this is the case, then what conclusions can you make about the total upward force compared to the total downward force?
Polokid16
Dec 8, 2007, 09:06 PM
Assuming that the system is at rest:
"_" - subscript
F_total = 25N + 62N = 87N
Now use the formula F_g = ma and rearrange it
m = F_g / a
Note: a = g = 9.81m/s^2
m= (87N) / (9.81m/s^2) = 8.9kg