Action-Reaction. When someone tries to jump off it, their forward push is equaled by the backward push exerted on the object they are pushing against.
It is all in Newton's third law: as your legs propel your body towards the dock, they also apply to the boat an equal force in the opposite direction, which pushes it away from the dock.
It's called a dock. A small platform would be called a Jetty. I also think it would be called a boardwalk or a boardplank.
Walking along the jetty towards his small fishing-boat, the fisherman noticed that the sea was much stiller than yesterday.
Pull The trailer away from the boat ramp.
you should stay at least 100yds away
a life boat
Cowboys loved a colorful phrase! This meant to go or run away. The image is of someone paddling a boat quickly.
pull the boat away from the boat ramp
You can either hijack someone's boat or get agency boat from air drop.
Someone standing up while the boat is manoeuvring.
over 10,000 boat sails are thrown away, but this is usually due to damage.
pull away from the boat ramp