Final answer:
A lever, such as pruning shears, can be used to remove branches from a tree, working to multiply the user's applied force. A saw, which is a type of wedge, is another simple machine that converts applied force into efficient cutting pressure.
Step-by-step explanation:
To remove branches from a tree, one effective simple machine to use is a lever, such as a pair of pruning shears. Pruning shears work like a double-lever system, allowing you to multiply the force of your hand grip to cut through the branch. This is analogous to the operation of scissors. The mechanical advantage of a lever is determined by the ratio of the length of the effort arm to the length of the resistance arm. Therefore, by applying a force at the longer end (effort arm), a greater force is exerted at the shorter end (resistance arm), where the cutting of the branch occurs. Another simple machine that could be used is a saw, which is a form of wedge. When using a saw, the force you apply is converted into cutting pressure at the sharp edge of the blade, allowing you to cut through the wood. The mechanical advantage in this case is based on the sharpness and angle of the wedge, making it easier to cut material with less force than would otherwise be required.