That, son, is a pulley. The pulley changes the direction of the force. A groved wheel turns around an axle. Then, a rope or chain is used to lift the heavier objects.
So the longer the ramp of the same height, the easier the object is to move?
What about that thing that leads onto the boat?
That's a ramp. They use those to move an object easier. They trade effort for a greater distance.
Those things are called seasaws right?
That's right! A seasaw is a type of lever. This boat must have been shipping them. Levers are a rigid bar that turns on a fulcrum. The longer the side with the load, the easier the object is to lift
How can you tell what will be more effective?
Levers involve something called mechanical advantage, just as all simple machines. Mechanical advantage is the ratio of output force to input force. We can tell a lever works by using the length of the arm on either side of the fulcrum. We use this to find Mechanical Advantage, telling us h ow effective something is.
Wow! That sounds like it makes work easier.
Work means something different in science. Work is the transfer of energy that comes from force applied over a distance.