S.H.M.: Is Acceleration Directly Proportional to Displacement?

[krissh]

Acceleration is directly proportional to DISPLACEMENT in S.H.M.

Is that true? a=-w^2x, so the graph has negative gradient, is this okay for direct proportion? I though it wasn't okay.

Thanks

 

[mfb]

"directly proportional" is independent of the sign. Yes it can be negative.

 

[krissh]

"directly proportional" is independent of the sign. Yes it can be negative.

Thank you:)