The friction force in the clutch works just like the blocks in the frication section of brake, except that the spring presses on the clutch plate instead of weight pressing the block into the ground.
The amount of force the clutch can hold depends on the friction between the clutch plate and they flywheel, and how much force the spring puts on the pressure plate.
离合器能传递的力的大小取决于离合器盘和飞轮之间的摩擦系数，以及弹簧对压盘的压紧力的大小。
3
As the driver lets loose the clutch pedal, spring pressure increase on the clutch parts. Friction between the parts also increases.