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Natural Laws and Car Control Chapter 5

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

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

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Review Gravity

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The Law of Gravity and Hill Parking

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Wheels to right Shift to neutral Roll into curb Shift to Park Set Parking Brake Wheels to right Shift to neutral Roll into curb Shift to Park Set Parking Brake 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.

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

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

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

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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.

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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

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

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

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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)

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Three factors that determine the force of impact 1.SPEED example? 2.WEIGHT example? 3. DISTANCE BETWEEN IMPACT & STOPPING example?

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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

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Always wear your seatbelt!!!