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One of the primary uses of screw threads is to provide powerful movements. This is because screw threads convert rotational motion into linear motion, allowing for significant force to be applied in a controlled manner. When a screw is turned, the helical shape of the thread allows it to move forward or backward when driven into a material, which amplifies the input force due to the mechanical advantage provided by the thread's geometry. This is essential in applications such as clamps, jacks, and fastening devices, where precise movements and secure holding capabilities are required.

In contrast, while increasing rotational speed and converting electrical to mechanical energy are important concepts, they are not directly related to the primary function of screw threads. Additionally, decreasing friction in machinery might be a benefit in certain contexts but is not the primary purpose of screw threads, which instead focus on creating movement and applying force effectively.