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CHAPTER 5
NATURAL LAWS AND CAR CONTROL
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CHAPTER 5
NATURAL LAWS AND CAR CONTROL
5.1 GRAVITY AND ENERGY OF MOTION
5.2 FRICTION AND TRACTION5.3 STOPPING DISTANCE5.4 CONTROLLING FORCE OF IMPACT
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GRAVITY : THE FORCE THAT PULLS ALL THINGS TO EARTH
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• DRIVING UPHILL:• LOSE SPEED• INCREASE POWER TO OVERCOME GRAVITY
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• DRIVING DOWNHILL:• GRAVITY INCREASES SPEED• TAKES LONGER TO STOP• SHIFT TO A LOWER GEAR TO HAVE ENGINE HELP SLOW
VEHICLE
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CENETR OF GRAVITY:THE POINT AROUND WHICH AN OBJECTS WEIGHT IS
EVENLY DISTRIBUTED.
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LOW CENTER OF GRAVITY=MORE STABLE
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High Center of Gravity = Less Stable!
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ENERGY OF MOTION
THE FORCE THAT CAUSES OBJECTS TO MOVE.
A.K.A. Kinetic energy
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WeightWEIGHT:ENERGY OF MOTION DOUBLES WHEN AN OBJECTS WEIGHT IS DOUBLED.
WHEN IT WEIGHS TWICE AS MUCH IT NEEDS TWICE THE DISTANCE TO STOP
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CHAPTER 5
SPEED:A CAR’S ENERGY OF MOTION WILL CHANGE
IN PROPORTION TO THE SQUARE OF IT’S 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!
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CHAPTER 5
SO ……….IF A CAR SPEEDS UP FROM 20MPH TO 60MPH HOW MUCH HAS THE STOPPING DISTANCE INCREASED?
ANSWER: 9 TIMES
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CHAPTER 5FRICTION:
THE FORCE THAT KEEPS EACH TIRE FROM SLIDING ON THE ROAD
TRACTION:IS CAUSED BY FRICTION SO
THAT THE TIRES GRIP THE ROAD
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• TIRE TREAD:• GROOVED
SURFACES OF THE TIRE THAT GRIP THE ROAD
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DIFFERENT TREADS
A) Off RoadB) Mud!C) RacingD)High Speed/Water
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WORN TREAD
= BLOWOUT!
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CHAPTER 5INFLATION AND TRACTION:
UNDERINFLATION
OVERINFLATION
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CHECKING TIRE TREAD
IF YOU CAN SEE ALL OF LINCOLN’S HEAD, SWITCH THE TIRE
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Total Stopping Distance
Perception distance
Reaction distance Braking distance
Oh No There’s a deer!!!!!!
The time it takes to
move your foot
to the brake
The time it takes your brakes to stop your
car
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CHAPTER 5
TOTAL STOPPING DISTANCE=
PERCEPTION TIME +REACTION TIME +BRAKING DISTANCE
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VEHICLE CONTROL IN CURVES
FACTORS TO CONSIDER
SPEED
SHARPNESS OF CURVE
BANKED CURVES
LOAD
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ENTERING A CURVE
• CAR WANTS TO GO STRAIGHT• THE FASTER YOU GO THE MORE IT
WANTS TO GO STRAIGHT!
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Factors That Effect Braking Distance
•Distance
•Speed
•Vehicle Condition
•Roadway surface
•Driver Ability
•Antilock Brakes
•Hills
•Loads
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FORCE OF IMPACT FACTORS
SPEEDWEIGHTDISTANCE
BETWEEN IMPACT AND STOPPING
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CHAPTER 5SAFETY BELTSACTIVE RESTRAINTS
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PASSIVE RESTRAINTS
• AIR BAGS• ATOMATICALLY
DEPLOY WHEN A COLLISION OCCURS
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Side Air Bags
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HOW TO WEAR YOUR SEATBELT
Comfortable
Low and snug across hips
Shoulder belt should be snug across chest
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AIRBAG DISTANCE
MUST HAVE 10 INCHES BETWEEN YOUR CHEST AND THE AIRBAGIN THE STEERING WHEEL
WHY?
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HAND POSITION WITH AIRBAG
HERE
AND HERE
WHY?
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AIRBAG SWITCHES
AIRBAGS ARE MADE FOR ADULTS
IF A CHILD IS IN THE FRONT SEAT THE AIRBAG MUST BE TURNED OFF
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OTHER SAFETY PROTECTION DEVICES
FRONT AND REAR CRASH AREAS
ENERGY ABSORBING BUMPERSREINFORCED WINDSHIELD
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HEAD RESTRAINTS
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CHILD SEATS
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ENERGY ABSORBING STEERING WHEEL AND COLUMN
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SIDE DOOR BEAMS
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AUTOMATIC SEATBELTS
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PADDED DASH