SS330 Lecture 3: Drive-Right-Chapter-5-Study-Guide
12 Feb 2019
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Gravity is the force that pulls all things to earth. If you hit a ball, drop a rock, or drive your vehicle over a pothole, gravity pulls each to earth. The point around which an object"s weight is evenly distributed is called its center of gravity. This force is called energy of motion, or kinetic energy. Friction is the force that keeps each tire from sliding on the road. You can feel this same force by rubbing your hands together. The friction created by the tire on the road is called traction. Traction makes it possible for your vehicle to grip the road so you can change speed and direction. Because of gravity, your car will go slower uphill than it would on a flat road. It would require more horsepower if you were carrying a large load. Also, if you were to remove your foot from the accelerator half way up a hill, you would slip back down.
