g is Positive. (5:07)
We draw a free body diagram and sum the forces on an object in projectile motion to prove the acceleration due to gravity, g, is positive.
This is an AP Physics 1 and an AP Physics C: Mechanics topic.
0:00 Why students often think g is negative
1:48 Drawing the Free Body Diagram
2:54 Summing the forces
3:54 a ≠ g