Simple Machines And Complex Machines

The diagram shows two uses of simple machines. The first use is represented by an inclined plane, which is denoted by X. The second use is represented by a pulley, which is denoted by Y.

The diagram shows two simple machines: III Inclined plane and IV Wheel and axle.

The correct answer is "Any instrument that helps us to do work easily." This answer accurately defines a machine as an instrument that assists in performing tasks with less effort or more efficiency. Machines are designed to simplify and expedite various types of work, making them an essential tool in many industries and everyday life.

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The use of a lever can be seen in option A, where a person is using a seesaw. A seesaw is a simple machine that consists of a lever with a fulcrum in the middle. When one person pushes down on one end, the other end rises up, demonstrating the principle of leverage.

A pair of scissors is considered a complex machine because it utilizes more than one simple machine to function. The simple machines used in scissors are a lever (III) and a wedge (IV). The lever allows for the opening and closing motion of the scissors, while the wedge is responsible for cutting through materials. Therefore, the correct answer is III and IV.

The tool shown in the diagram consists of a lever and a wedge. A lever is a simple machine that consists of a rigid bar that pivots around a fixed point called a fulcrum. In the diagram, the long handle of the tool acts as a lever. A wedge is another simple machine that is a triangular-shaped object with a sharp edge. In the diagram, the pointed end of the tool acts as a wedge. Therefore, the correct answer is lever and wedge.

The diagram shows a crane lifting an object, which requires a system of pulleys. The crane has both fixed and movable pulleys, as indicated by the presence of multiple ropes and wheels. Fixed pulleys are attached to a stationary point, while movable pulleys are attached to the object being lifted. This combination of fixed and movable pulleys allows for increased mechanical advantage, making it easier to lift heavy objects. Therefore, the correct answer is fixed and movable pulleys.

The application of screws and gears can be found in a watch. Watches often have gears that work together to accurately measure time, and screws are commonly used to hold the various components of the watch together. The other objects listed, such as a paper cutter, scissors, and wheelbarrow, do not typically involve the use of screws and gears in their functioning.

When fixing a screw into a wooden plank using a screwdriver, the screwdriver acts as the wheel and axle. The handle of the screwdriver acts as the wheel, providing a larger radius for applying force, while the tip of the screwdriver acts as the axle, allowing the rotation to be transferred to the screw. This simple machine allows for the efficient and effective insertion of the screw into the wooden plank.