1. The problem statement, all variables and given/known data Problem: A 12.0-kg block is pushed to the left across a rough horizontal surface by a force that is angled 30.0◦ below the horizontal. The magnitude of the force is 75.0 N and the acceleration of the block as it is pushed is 3.20 m/s^2 . What angle does the force exerted on the block by the surface make with the horizontal? For this I have : m= 12kg theta= 30 degrees applied force: 75 N acceleration= 3.20 m/s^2 2. Relevant equations For this problem I didn't use any equations, I only drew a picture and free body diagram (attached). 3. The attempt at a solution Sorry if the image is big I guess the main reason I didn't use any equations was because I am a little confused on what the question is asking for. Would the angle in question simply be 90 degrees? Isn't the force exerted on the block by the surface the normal force, which would be perpendicular to the horizontal? Thank you for all the help.