Because the wood is between the rock and the log.
The wood is force, the rock is resistance and the log is fulcrum so it's a third class lever
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The moving rock with a board and log is an example of a simple machine called a lever. In this case, it likely represents a first-class lever, where the rock acts as the fulcrum, the board is the lever arm, and the log provides the effort to lift or move the load.
Newton's Law - For every action there is an equal and opposite reaction. In order for you to move forward, there must be a force going backward. That is evidenced by the backward motion of the log.
log
Using a log tongs or hook to grab and lift the log. Using a winch or come-along attached to a tree or anchor point. Rolling the log onto a skid, sled, or log arch for easier transportation.
When a frog jumps from a log, it pushes against the log with a force (action force) which propels it forward. Simultaneously, the log exerts an equal and opposite force (reaction force) back on the frog, enabling it to launch into the air. This is in accordance with Newton's third law of motion - for every action, there is an equal and opposite reaction.
A floating log of wood will be buoyant in water due to its low density, allowing it to remain on the surface. It may also drift with the current of the water, potentially traveling long distances. The log's shape, size, and weight will influence its stability and how it interacts with the water.