NATURAL LAWS AND CAR CONTROL

1
CHAPTER 5

• NATURAL LAWS AND CAR CONTROL

2
CHAPTER 5

• NATURAL LAWS AND CAR CONTROL
• 5.1 GRAVITY AND ENERGY OF MOTION
• 5.2 FRICTION AND TRACTION
• 5.3 STOPPING DISTANCE
• 5.4 CONTROLLING FORCE OF IMPACT

3
CHAPTER 5

• GRAVITY
• THE FORCE THAT PULLS ALL THINGS TO EARTH
• DRIVING UPHILL
• LOSE SPEED
• INCREASE POWER TO OVERCOME GRAVITY
• DRIVING DOWNHILL
• GRAVITY INCREASES SPEED
• TAKES LONGER TO STOP
• SHIFT TO A LOWER GEAR TO HAVE ENGINE HELP SLOW
  VEHICLE

4
CHAPTER 5

• CENETR OF GRAVITY
• THE POINT AROUND WHICH AN OBJECTS WEIGHT IS
  EVENLY DISTRIBUTED.
• LOW CENTER OF GRAVITYMORE STABLE
• HIGH CENTER OF GRAVITYLESS STABLE

5
ENERGY OF MOTION
A.K.A. Kinetic energy

• THE FORCE THAT CAUSES OBJECTS TO MOVE.

6
Weight

• WEIGHT
• ENERGY OF MOTION DOUBLES WHEN AN OBJECTS WEIGHT
  IS DOUBLED.
• WHEN IT WEIGHS TWICE AS MUCH IT NEEDS TWICE THE
  DISTANCE TO STOP

7
CHAPTER 5

• SPEED
• A CARS ENERGY OF MOTION WILL CHANGE IN
  PROPORTION TO THE SQUARE OF ITS CHANGE IN SPEED.
• EXAMPLE SPEED GOES FROM 20-40 MPH (IT HAS
  MULTIPLIED 2X)
• 2 SQUARED IS 4 SO..
• IT WILL NEED FOUR TIMES THE DISTANCE TO STOP!

8
CHAPTER 5

• SO .
• IF A CAR SPEEDS UP FROM 20MPH TO 60MPH HOW MUCH
  HAS THE STOPPING DISTANCE INCREASED?
• ANSWER 9 TIMES

9
CHAPTER 5

• FRICTION
• THE FORCE THAT KEEPS EACH TIRE FROM SLIDING ON
  THE ROAD
• TRACTION
• CAUSED BY FRICTION SO THAT THE TIRES GRIP THE
  ROAD

10
CHAPTER 5

• TIRE TREAD
• GROOVED SURFACES OF THE TIRE THAT GRIP THE
  ROAD
• WORN TREAD
• BLOWOUT

11
CHAPTER 5

• INFLATION AND TRACTION
• UNDERINFLATION
• OVERINFLATION

12
CHAPTER 5

• CHECKING TIRE TREAD

IF YOU CAN SEE ALL OF LINCOLNS HEAD, SWITCH THE
TIRE
13
Total Stopping Distance
The time it takes your brakes to stop your car
Oh No Theres a deer!!!!!!
The time it takes to move your foot to the brake
Perception distance
Reaction distance
Braking distance
14
CHAPTER 5

• TOTAL STOPPING DISTANCE
• PERCEPTION TIME
• REACTION TIME
• BRAKING DISTANCE

15
(No Transcript)
16
CHAPTER 5
FACT Most people speed to save time however,
you dont get there more than a few minutes
sooner. And if you are stopped and given a
ticket, it will cost you both time and money.  
TIME SAVED OVER 10 MILE TRIP
17
CHAPTER 5

• VEHICLE CONTROL IN CURVES

FACTORS TO CONSIDER SPEED SHARPNESS OF
CURVE BANKED CURVES LOAD
18
Factors That Effect Braking Distance

• Distance
• Speed
• Vehicle Condition
• Roadway surface
• Driver Ability
• Antilock Brakes
• Hills
• Loads

19
CHAPTER 5

• FORCE OF IMPACT FACTORS

SPEED WEIGHT DISTANCE BETWEEN IMPACT AND
STOPPING
20
CHAPTER 5

• SAFETY BELTS
• ACTIVE RESTRAINTS
• PASSIVE RESTRAINTS

21
HOW TO WEAR YOUR SEATBELT
Comfortable Low and snug across hips Shoulder
belt should be snug across chest
22
AIRBAG DISTANCE
MUST HAVE 10 INCHES BETWEEN YOUR CHEST AND THE
AIRBAGIN THE STEERING WHEEL
WHY?
23
HAND POSITION WITH AIRBAG
AND HERE
HERE
WHY?
24
AIRBAG SWITCHES
AIRBAGS ARE MADE FOR ADULTS IF A CHILD IS IN THE
FRONT SEAT THE AIRBAG MUST BE TURNED OFF
25

• OTHER SAFETY PROTECTION DEVICES
• FRONT AND REAR CRASH AREAS
• ENERGY ABSORBING BUMPERS
• REINFORCED WINDSHIELD

26
HEAD RESTRAINTS
27
CHILD SEATS
28
ENERGY ABSORBING STEERING WHEEL AND COLUMN
29
SIDE DOOR BEAMS
30
AUTOMATIC SEATBELTS
31
PADDED DASH