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# Calculating and applying forces

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I am working on the way forces are used in my physics engine and was hoping possible someone could comment if this was general idea (it seems to be from what I gathered from other physics engine/docs)

[color="#000000"][font="Arial"]Apply Gravity to total forces[/font]
[color="#000000"]
[color="#000000"][font="Arial"]Calculate Collisions (using total force + velocity for detecting collision)[/font]
[color="#000000"][font="Arial"]- If there is a friction, add the friction force to total force[/font]
[color="#000000"][font="Arial"]- If there is resting, subtract out the gravity from total force[/font]
[color="#000000"]
[color="#000000"][font="Arial"]Calculate acceleration as “acceleration = total force/mass”[/font]
[color="#000000"][font="Arial"]Calculate velocity as “velocity += acceleration * dt[/font]
[color="#000000"][font="Arial"]Calculate new position as “new position = current position + velocity”[/font]
[color="#000000"]
[color="#000000"][font="Arial"]Set total forces to zero, set acceleration to zero.

Edit: corrected my acceleration formula
[/font]

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I think you want acceleration to be calculated using total force/mass, but apart from that everything else looks fine.

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You almost got it. The below scheme is simpe, effective and widely used. It's called the symplectic Euler integration algorithm.

calculate forces

acceleration = force / mass
velocity += acceleration * dt
position += velocity * dt

reset forces and start all over

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I think you want acceleration to be calculated using total force/mass, but apart from that everything else looks fine.

Ah yes, that is what I meant.

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