A car tire is inflated to 20 poundsforce per square inch If

A car tire is inflated to 20 pounds-force per square inch. If the tire has an area of 0.35 square feet in contact with the road, how much force is exerted by all four tires? The force is N.

Solution

pressure in 1 tire = 20 pound-force /square inch

area = 0.35 square feet = 0.35*144 square inch

so force exerted by 1 tire= 0.35*144*20 pound-force = 1008 pound-force

so

force exerted by all 4 tires = 4 * 0.35*144*20 pound-force = 4* 1008 pound-force

= 4032 pound-force = 4032 * 4.44822 N =17935.23 N