News broadcast again: Truck skidded on snowy road, truck turned upside down. Shangrao Evening News reported on January 8, 2013 (Reporter Xia Meng’s photography report) On January 5, a truck passed by

News broadcast again: Truck skidded on snowy road, truck turned upside down. Shangrao Evening News reported on January 8, 2013 (Reporter Xia Meng’s photography report) On January 5, a truck passed by 3

(1) When braking, the brake pads and wheel rims never separate. The brake pads always slide on the wheel surface, so there is sliding friction between the two; The pressure of the leather on the wheel rim increases, thus increasing the friction between them.

(2) Because there is ice and snow on the road, the roughness of the contact surface is reduced, so the friction between the tires and the ground will become smaller when the car is driving, and the car will slide farther after braking than without ice and snow ( (or long) are prone to traffic accidents; therefore, friction can be increased by increasing the roughness of the contact surface, for example: adding anti-skid chains to car wheels (or spreading ashes, spreading straw, etc. on icy and snowy roads).

So the answer is: (1) Sliding, pressure.

(2) Small, add anti-skid chains to the car wheels (or spread ashes, spread straw, etc. on the icy and snowy roads).