The bicycle wheel may not be turning anymore due to a variety of reasons such as a flat tire, a loose or broken chain, a malfunctioning brake, or a problem with the wheel's bearings. It could also be caused by a misalignment of the wheel or issues with the gears. It is important to inspect the bicycle carefully to identify the specific issue causing the wheel to stop turning and address it accordingly to get the bicycle back in working condition. **

There could be several reasons why the bicycle speedometer is not turning on. It could be due to a dead or low battery, a loose connection, or a malfunctioning speed sensor. First, check the battery and replace it if necessary. Then, ensure that all connections are secure and that the speed sensor is properly aligned and functioning. If the issue persists, it may be necessary to consult the user manual or seek professional assistance to troubleshoot and resolve the problem. **

The pedal may be turning heavily on the bicycle due to a lack of lubrication on the pedal or crankshaft. This can cause increased friction between the moving parts, making it harder to pedal smoothly. Another possible reason could be a misalignment or damage to the pedal or crankshaft, causing them to not rotate properly. It is important to regularly maintain and inspect the pedals and crankshaft to ensure they are in good working condition. **

The front wheel of a bicycle may be turning heavily due to several reasons. One common reason is that the wheel may be misaligned or not properly seated in the fork, causing it to rub against the brake pads or the frame. Another reason could be that the wheel bearings are worn out or not properly lubricated, causing increased friction and resistance. Additionally, a misaligned or bent fork can also cause the front wheel to turn heavily. It is important to regularly inspect and maintain the front wheel to ensure smooth and efficient operation. **

The rear wheel of the bicycle may not be turning anymore due to a variety of reasons. It could be that the chain has come off the gears or is stuck, the gears may be damaged or worn out, the brakes may be engaged and preventing the wheel from turning, or there could be an issue with the hub or axle. It's important to inspect and troubleshoot these potential issues to determine the exact cause of the problem and make the necessary repairs to get the rear wheel turning again. **

Longitudinal turning involves cutting along the length of the workpiece, while face turning involves cutting across the face of the workpiece. Longitudinal turning is used to create cylindrical shapes and grooves, while face turning is used to create flat surfaces and contours. Additionally, longitudinal turning is typically used for creating external features, while face turning is used for creating internal features. **

A turning point with a horizontal turning tangent occurs when the slope of the curve at that point is zero, meaning the tangent line is horizontal. This indicates that the function changes from increasing to decreasing or vice versa at that point. In other words, the function reaches a maximum or minimum value at that point. This type of turning point is also known as a stationary point. **

Face turning and longitudinal turning are two different types of machining operations used in metalworking. Face turning involves cutting material from the surface of a workpiece to create a flat surface, while longitudinal turning involves cutting material from the length of the workpiece to create a cylindrical shape. In face turning, the cutting tool moves perpendicular to the workpiece, while in longitudinal turning, the cutting tool moves parallel to the workpiece. Overall, the main difference between the two is the direction in which the cutting tool moves in relation to the workpiece. **