The force of the first blow knocked the man from his feet.

The force of the impact knocked the breath from his body.

The force of the blow knocked the man to one side.

The force of the pop knocked me over onto my side.

The force of it knocked them both to the floor.

The force of the blast knocked him back against the door.

The force of the explosion knocked him off his feet.

The force of the blow knocked her away from the door.

It was more like flying through water than air, as the forces knocked them first one way, then the other.

The force of my partner's voice actually knocked me back two steps.