Identify the kind of simple machine represented by each of these examples: a. A drill bit b. A skateboard ramp c. A boat oar
The Correct Answer and Explanation is:
Here are the types of simple machines represented by each example:
a. A drill bit – Screw
b. A skateboard ramp – Inclined Plane
c. A boat oar – Lever
Explanation
Simple machines are tools that make work easier by allowing us to apply force more efficiently. They include the lever, inclined plane, wedge, screw, pulley, and wheel and axle. Each of the examples listed uses one of these principles in a unique way.
a. A drill bit functions as a screw, which is essentially an inclined plane wrapped around a central shaft. The spiraling ridges on a drill bit help convert rotational force (torque) into linear force. As it turns, it moves deeper into the material with minimal effort, effectively cutting and removing material. Screws are powerful tools for converting circular motion into a forward or downward force, making the drill bit ideal for penetrating hard surfaces.
b. A skateboard ramp is an example of an inclined plane, one of the most basic simple machines. An inclined plane allows an object to be raised without lifting it straight up. It reduces the effort needed to move a load vertically by spreading the force over a longer distance. Skateboarders use ramps to gradually gain height, just as workers use ramps to move heavy objects to elevated surfaces.
c. A boat oar acts as a lever. A lever is a rigid bar that pivots around a fixed point called the fulcrum. In rowing, the fulcrum is the oarlock (where the oar pivots), the effort is applied by the rower’s hands, and the load is the water resistance pushing against the blade. By using the oar as a lever, rowers amplify their force, allowing them to move the boat efficiently through water.
These simple machines demonstrate how mechanical advantage can be achieved, reducing the force required to complete tasks and improving efficiency in everyday tools and actions.
