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CHAPTER 5. NATURAL LAWS AND CAR CONTROL. 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. GRAVITY : THE FORCE THAT PULLS ALL THINGS TO EARTH. DRIVING UPHILL: LOSE SPEED
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CHAPTER 5 NATURAL LAWS AND CAR CONTROL
CHAPTER 5 NATURAL LAWS AND CAR CONTROL 5.1GRAVITY AND ENERGY OF MOTION 5.2 FRICTION AND TRACTION 5.3 STOPPING DISTANCE 5.4 CONTROLLING FORCE OF IMPACT
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
CENETR OF GRAVITY: THE POINT AROUND WHICH AN OBJECTS WEIGHT IS EVENLY DISTRIBUTED.
A.K.A. Kinetic energy ENERGY OF MOTION THE FORCE THAT CAUSES OBJECTS TO MOVE.
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
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!
CHAPTER 5 SO ………. IF A CAR SPEEDS UP FROM 20MPH TO 60MPH HOW MUCH HAS THE STOPPING DISTANCE INCREASED? ANSWER: 9 TIMES
CHAPTER 5 FRICTION: THE FORCE THAT KEEPS EACH TIRE FROM SLIDING ON THE ROAD TRACTION: IS CAUSED BY FRICTION SO THAT THE TIRES GRIP THE ROAD
TIRE TREAD: • GROOVED SURFACES OF THE TIRE THAT GRIP THE ROAD
DIFFERENT TREADS Off Road Mud! Racing High Speed/Water
WORN TREAD = BLOWOUT!
CHAPTER 5 INFLATION AND TRACTION: UNDERINFLATION OVERINFLATION
CHECKING TIRE TREAD IF YOU CAN SEE ALL OF LINCOLN’S HEAD, SWITCH THE TIRE
Total Stopping Distance The time it takes your brakes to stop your car Oh No There’s a deer!!!!!! The time it takes to move your foot to the brake Perception distance Reaction distance Braking distance
CHAPTER 5 TOTAL STOPPING DISTANCE= PERCEPTION TIME + REACTION TIME + BRAKING DISTANCE
FACTORS TO CONSIDER SPEED SHARPNESS OF CURVE BANKED CURVES LOAD VEHICLE CONTROL IN CURVES
ENTERING A CURVE • CAR WANTS TO GO STRAIGHT • THE FASTER YOU GO THE MORE IT WANTS TO GO STRAIGHT!
Factors That Effect Braking Distance • Distance • Speed • Vehicle Condition • Roadway surface • Driver Ability • Antilock Brakes • Hills • Loads
FORCE OF IMPACT FACTORS SPEED WEIGHT DISTANCE BETWEEN IMPACT AND STOPPING
CHAPTER 5 SAFETY BELTS ACTIVE RESTRAINTS
PASSIVE RESTRAINTS • AIR BAGS • ATOMATICALLY DEPLOY WHEN A COLLISION OCCURS
HOW TO WEAR YOUR SEATBELT Comfortable Low and snug across hips Shoulder belt should be snug across chest
AIRBAG DISTANCE MUST HAVE 10 INCHES BETWEEN YOUR CHEST AND THE AIRBAGIN THE STEERING WHEEL WHY?
HAND POSITION WITH AIRBAG AND HERE HERE WHY?
AIRBAG SWITCHES AIRBAGS ARE MADE FOR ADULTS IF A CHILD IS IN THE FRONT SEAT THE AIRBAG MUST BE TURNED OFF
OTHER SAFETY PROTECTION DEVICES FRONT AND REAR CRASH AREAS ENERGY ABSORBING BUMPERS REINFORCED WINDSHIELD
