Question: Three forces are acting on a 4-kg block. The acceleration of the block is 5.0 $m/s^2$. Find the magnitude of the unknown force $F$.
The diagram I have shows the force F point left, a force of 4N point right and a force of 8N pointing straight up.
I found that Fnet would be 20 (F = ma – 5*4 = 20). Which leads me to my question... How do I calculate the Fnet from a free body diagram? I've done it where you are only dealing with one axis (x or y), but here it only gives me three forces, and i'm not sure how to find the unknown.
Thanks for your help guys but I found the answer (22.3).