1 Acceleration2 Acceleration3 Action / reaction4 Action / reaction5 Action / reaction6 Action / reaction7 Action / reaction8 Balance / imbalance9 Balance / imbalance10 Balance / imbalance11 Balance / imbalance12 Barrier13 Barrier Barrier 1 Barrier 214 Barrier15 Centralisation / decentralisation16 Centralisation / decentralisation17 Centralisation / decentralisation18 Centralisation / decentralisation19 Components20 Components21 Components22 Components23 Components . . . .24 Components25 Componen
