How to reduce friction with the help of wheel

 227 On wheels can be significantly reduced by moving objects 1s Pulling the heavy suitcase to the ground to move a heavy suitcase prevents sliding friction between heavy suitcases to the ground. Now, if this heavy suitcase is fitted with small wheels (it can be pulled off very easily. This is because the sliding friction is converted to rolling friction when we attach the pd. And the suitcase And rotate the ground wheel) Thus, R can be attached to wheels (or rollers) with a heavy suitcase to be moved to another heavy object). 

Evenn a very small rolling can cause a child to pull a heavy suitcase fitted with a small suitcase (or see Figure 29). From this discussion we conclude that friction can be achieved by attaching wheels to moving objects. So, wheels are often used (rollers) closing the wheel. Duality friction. In fact, all moving vehicles (such as bicycles, cars, buses Figure 29. The use of wheels arifers (or rollers) reduces friction. Is fitted with wheels to reduce friction along the road) (so that They can move forward. Simplicity). As we move forward, we should know the meaning of left ball bearings. 

Because'Balll bearing is a device consisting of small metal spheres (see Figure 30). Small metal balls can roll bearing freely. Ball bearings are designed to roll the sine parts of the machine on top of each other instead of rolling the ball bearings on top of each other between the two surfaces. For example, the axle is fixed to the inner side of a ball bearing and the wheel ball is fixed to the outer d ball. Ball bearings reduce friction by extending the two surfaces (axle and wheel) toward each other. 

Thiss is due to the rolling action of the small metal balls inside the ball metal balls (which roll). A ball bearing. Friction can be reduced by using ball bearings between moving parts of machines. We have just studied that friction can be reduced by the use of wheels. Even a wheel produces some etan where its central hole (or hub) rubs with the axle [see Figure 31 (a)]. To reduce friction still, dales are applied to 'ball bearings'. 

Thee ball bearings are fixed between the hub of the wheel and axle. Which axle ball will bewig wheel (b) When a ball bearing is inserted between the wheel and the hub of the axle, friction (a) The wheel produces some friction, where its hub (central hole) rubs against the axle while moving. , Reducing the balls and friction of the ball bearing roll when the wheel rotates [see Figure 31 (b)], therefore, the use of hall bearings makes the wheel roll on the axle smoothly. Since rolling friction is much smaller than king friction, sliding friction machines using ball bearings replace slippery friction in most machines. Thus, friction is minimized by using ball bearings in most machines.

 For example, high-wheel wheels turn on a set of ball bearings. These ball bearings reduce friction as they roll instead of slide. The use of ball bearings in machines reduces friction because then rolling friction comes into play.