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Lesson 3 of 15
Natural Forces Affecting the Driver
2 hoursFree
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Learning Objectives
By the end of this lesson you'll be able to:
- 1Explain how gravity, inertia, friction, and kinetic energy act on your car.
- 2Predict how speed changes stopping distance and force of impact.
- 3Adjust your speed for hills, curves, and reduced traction.
Step 1 of 6
A. Natural Laws and Driving an Automobile
Key Things to Remember
- Crash energy and stopping distance grow with speed squared — small speed cuts help a lot.
- Engine-brake down long hills; riding the brakes causes brake fade.
- Tread plus dry pavement gives grip; rain, ice, and bald tires take it away.
- Slow before a curve — braking and turning share the same traction.
More Videos
Understanding Car Crashes — It's Basic Physics — Insurance Institute for Highway Safety (Educational)
Content based on the 2025 CA Driver Handbook. Always verify current requirements at dmv.ca.gov.