Calculate the force of the driven wheel
Publish: 2021-05-19 11:00:16
1. Suppose the bicycle moves forward,
because the direction of friction is opposite to the relative movement trend of the object,
when the driving wheel (i.e. driven by the chain) moves, the lowest point of the wheel contacts the ground. This point moves backward relative to the ground,
so the friction from the ground to the rear wheel moves forward,
the driven wheel itself will not move spontaneously, Because the rear wheel moves, the whole car body must move forward (including the front wheel that will not move spontaneously) because the ground will not move, then the front wheel moves forward relative to the ground
so the friction of the ground to the front wheel is backward,
the friction of both wheels is rolling friction
because the direction of friction is opposite to the relative movement trend of the object,
when the driving wheel (i.e. driven by the chain) moves, the lowest point of the wheel contacts the ground. This point moves backward relative to the ground,
so the friction from the ground to the rear wheel moves forward,
the driven wheel itself will not move spontaneously, Because the rear wheel moves, the whole car body must move forward (including the front wheel that will not move spontaneously) because the ground will not move, then the front wheel moves forward relative to the ground
so the friction of the ground to the front wheel is backward,
the friction of both wheels is rolling friction
2. The driving wheel is the driving wheel of the motor, and the driven wheel is the wheel of the load. If the output torque of the motor is equal to the required torque of the load, that is, the power of the motor matches the required power of the load, then the tension on the belt can be calculated according to the output torque of the motor. The calculation formula of the motor torque can be obtained from the sample: torque = 9550 * kW / rpm, The torque unit is N.M. the theoretical calculation should be 1000 / motor wheel radius mm * motor torque = pull force on the belt. I don't know if I want my friends to correct me. Thank you!
3. When a bicycle is riding normally, the driving wheel is subjected to forward static friction and the driven wheel is subjected to backward rolling friction
at the same time, the driving and driven wheels are also subject to static friction to prevent the bicycle from sideslipping, which is generally not considered)
you can imagine that the riding bicycle will be suspended:
the driven wheel (usually the front wheel) will no longer rotate, so when riding on the ground, the driven wheel will roll under the backward friction of the ground
the driving wheel (usually the rear wheel) will continue to rotate, and the lower surface of the wheel is backward, so when riding on the ground, the contact point between the driving wheel and the ground tends to slide backward (generally speaking, the driving wheel pushes the ground backward), so it is subject to forward friction.
at the same time, the driving and driven wheels are also subject to static friction to prevent the bicycle from sideslipping, which is generally not considered)
you can imagine that the riding bicycle will be suspended:
the driven wheel (usually the front wheel) will no longer rotate, so when riding on the ground, the driven wheel will roll under the backward friction of the ground
the driving wheel (usually the rear wheel) will continue to rotate, and the lower surface of the wheel is backward, so when riding on the ground, the contact point between the driving wheel and the ground tends to slide backward (generally speaking, the driving wheel pushes the ground backward), so it is subject to forward friction.
4. A wheel that provides power is called a driving wheel, such as a bicycle. When you ride forward, the rear wheel is the driving wheel and provides power. The front wheel is the driven wheel. When you just push forward, the front and rear wheels are driven wheels. When the wheel is the driving wheel, the friction is the power. When you ride forward, the friction of the driven wheel acts as resistance, Backward
judge the direction essence of friction or the direction hindering relative motion.
judge the direction essence of friction or the direction hindering relative motion.
5. (1) Assuming that the driving wheel is on the left and the driven wheel is on the right, and the driving wheel moves clockwise,
the driving wheel will receive traction, that is, the driving force, which drives the belt pulley to move. The belt tends to move backward but does not slip, so the belt moves to the right, that is, the friction between the driving wheel and the belt is static friction
(2) the belt drives the driven pulley to move,
the driven pulley is that the belt moves first and then drives the driven pulley, so the friction force on the belt is opposite to the direction of rotation of the driven pulley. (take the belt as an object and the driven pulley as a desktop), Therefore, the direction of friction on the driven wheel is the same as that of the driving wheel (that is, the driven wheel will only rotate because of the friction on the driven wheel)
there is no sliding between them, so the friction is static.
the driving wheel will receive traction, that is, the driving force, which drives the belt pulley to move. The belt tends to move backward but does not slip, so the belt moves to the right, that is, the friction between the driving wheel and the belt is static friction
(2) the belt drives the driven pulley to move,
the driven pulley is that the belt moves first and then drives the driven pulley, so the friction force on the belt is opposite to the direction of rotation of the driven pulley. (take the belt as an object and the driven pulley as a desktop), Therefore, the direction of friction on the driven wheel is the same as that of the driving wheel (that is, the driven wheel will only rotate because of the friction on the driven wheel)
there is no sliding between them, so the friction is static.
6. The driving wheel provides power and the driven wheel starts to move e to friction
they move in the same direction, but the direction of friction is different
the friction of the driving wheel is opposite to the motion direction, while the friction of the driven wheel is the same as the motion direction.
they move in the same direction, but the direction of friction is different
the friction of the driving wheel is opposite to the motion direction, while the friction of the driven wheel is the same as the motion direction.
7. The front and rear wheels of the bicycle are subject to static friction, and the rear wheels move backward because they are equivalent to the ground, so they move forward; The front wheel can be understood as the ground makes it rotate, then the movement trend is forward, then the direction is backward
what really makes the bicycle move forward is the static friction of the rear wheel, that is, the power, and the resistance of the front wheel
if the car is regarded as a whole, the wheel is a component, then the rolling friction between the car and the ground
what really makes the bicycle move forward is the static friction of the rear wheel, that is, the power, and the resistance of the front wheel
if the car is regarded as a whole, the wheel is a component, then the rolling friction between the car and the ground
8. This understanding: the driving wheel is its own active rotation, the belt prevents it from rotating, so the binding force of the driving wheel is to prevent the wheel from rotating, so it is opposite to the direction of movement. The driven wheel does not move and is rotated by itself. The driven wheel is originally static, but the belt wants it to move, just like someone pushes you. You don't want to move. Relative to yourself, you are forced to move. Therefore, it can be said that you are constrained to move. The binding force makes you move in the same direction as the binding force. From the point of view of mechanics, an object will not change its original state when it is not under force. Therefore, the driven wheel must get an external force to rotate, and this external force is the binding force
9. When a bicycle is riding normally, the driving wheel is subjected to forward static friction and the driven wheel is subjected to backward rolling friction
at the same time, the driving and driven wheels are also subject to static friction to prevent the bicycle from sideslipping, which is generally not considered)
you can imagine that the riding bicycle will be suspended:
the driven wheel (usually the front wheel) will no longer rotate, so when riding on the ground, the driven wheel rolls under the backward friction of the ground
the driving wheel (usually the rear wheel) will continue to rotate, and the lower surface of the wheel is backward, so when riding on the ground, the contact point between the driving wheel and the ground tends to slide backward (generally speaking, the driving wheel pushes the ground backward), so it is subject to forward friction.
at the same time, the driving and driven wheels are also subject to static friction to prevent the bicycle from sideslipping, which is generally not considered)
you can imagine that the riding bicycle will be suspended:
the driven wheel (usually the front wheel) will no longer rotate, so when riding on the ground, the driven wheel rolls under the backward friction of the ground
the driving wheel (usually the rear wheel) will continue to rotate, and the lower surface of the wheel is backward, so when riding on the ground, the contact point between the driving wheel and the ground tends to slide backward (generally speaking, the driving wheel pushes the ground backward), so it is subject to forward friction.
Hot content