1. Natural Laws and Car Control
Chapter 5

2. Gravity How will gravity affect your speed going uphill? Lose speed
to keep same speed you must accelerate to overcome gravity

3. Gravity How will gravity affect your speed going downhill?
Speed will increase
Take longer to stop
Must brake sooner
Look further ahead for hazards

4. Review Gravity

5. The Law of Gravity
and Hill Parking

6. What are the steps? Downhill with curb
When you are parked on an incline, gravity works to pull your vehicle downhill.
To keep your vehicle from rolling, leave your vehicle in low gear or park.
Wheels to right
Shift to neutral
Roll into curb
Shift to Park
Set Parking Brake
What are the steps? Downhill with curb

7. What are the steps? Downhill with curb
Wheels to right
Shift to neutral
Roll into curb
Shift to Park
Set Parking Brake
What are the steps? Downhill with curb

8. TO THE RIGHT
What step do you skip?
Yes, there is no curb to roll into.
You’ll be parking downhill with no curb. Which way will you turn the wheel?

9. You are already parked uphill without a curb, which way are your wheels turned?
TO THE RIGHT
Will you put it into neutral and roll?
Again, there is no curb to stop us.

10. Center of Gravity
What is it?—The point around which an objects’ weight is evenly distributed
Check out pictures on page 92 and 93 in your textbook.

11. Inflation & Traction Check out pictures on page 94 & 95
It is important to have properly inflated tires because…
You will have Poor Traction
Under-inflation (tire not filled up properly)—outside edges will touch ground and will wear out faster
Over-inflation (tire filled up too much)– only center part of tire is touching ground and will wear out faster

12. Total Stopping Distance pictures on page 98 & 99
TSD = Distance your car travels while you make a stop

13. total stopping distance 1. Perception time & distance
3 Parts to
total stopping distance
1. Perception time & distance
2. Reaction time & distance
3. Braking distance

14. Factors affecting braking distance
1. speed
2. vehicle condition
3. roadway surface
4. driver ability
5. antilock braking system
6. hills
7. load (amount of weight in vehicle)

15. Three factors that determine the force of impact
SPEED—example?
WEIGHT—example?
3. DISTANCE BETWEEN IMPACT & STOPPING—example?

16. Seat Belts Three collisions occur when a vehicle hits a solid object.
1. Vehicle hits object & stops
2. Occupants either hit inside vehicle or restraint devices
3. Occupants may suffer internal collisions when organs impact inside their bodies

17. Always wear your seatbelt!!!