Answer:
Greater acceleration of the plates towards each other
Step-by-step explanation:
If more force is added to the convection currents, there would be a greater acceleration of the plates towards each other.
A lithospheric plate is driven by underlying asthenosphere which is ductile and readily flows. The plate lies on the asthenosphere.
The rate of movement of the asthenosphere determines the rate at which the plate above is moving.
The greater the convection below, the faster the plate moves.