On motion: heavy bodies sustain their movement; the long-jumper's trick
Water leaps bridging a current, then the rule that weight lengthens a jump
This text-only page, in mirror script, opens on water leaps made at f and g that stay high and form a bridge over the current turning beneath before it rushes out with impetus. Under the heading 'On motion' Leonardo states that the heavier a body is, the more power it sustains its motion with. He illustrates this with long-jumpers who swing their clenched fists back and then hurl them forward at the spring, lengthening the jump, and with those who grip two heavy stones to lengthen it further still.
On this page
Water leaps at f and g forming a bridge over the current
Two leaps made by f and g leave the water high opposite the leap, so that the leap makes a bridge over the course of the water. The current turns about beneath this arch and then rushes out with impetus. The passage continues the manuscript's study of how falling and rebounding water shapes its own channel.
The heavier the body, the more it sustains its motion
Under the heading 'On motion' Leonardo states that the heavier a thing is, the more power it pursues its motion with. The principle links greater weight to greater persistence of movement. It frames the human examples that follow.
Long-jumpers swinging fists and gripping stones
Jumpers with feet together throw their clenched fists backward and hurl them forward with fury at the spring, finding the jump made greater by this motion. Many increase the jump further by taking two heavy stones in their hands and performing with them the office once done with the fists. The added weight, swung forward, lengthens the leap considerably.