Idaho Public Driver Education. Natural Laws Affecting Vehicle Control. GRAVITY. The natural force that pulls all things to earth. The center of gravity is where a body’s mass is ___________. Throw a ball into the air and it________. Gravity gives objects their ________. ENERGY OF MOTION.
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Natural Laws Affecting Vehicle Control
The natural force that pulls all things to earth
The center of gravity is where a body’s mass is ___________
Throw a ball into the air and it________
Gravity gives objects their ________
The white truck and the dump truck are going the same speed.
Which vehicle has more energy of motion?
EFFECT OF SPEED AND WEIGHT
A vehicle’s energy of motion changes in proportion to the square of the change in speed
Takes FOUR times the distance to stop
Takes NINE times the distance to stop
To stop a vehicle going 60mph would generate approximately enough heat to boil ½ gallon of water!
Inertia wants to keep these parked cars at rest.
Why, when driving through this curve, does inertia create the sensation that you are being pulled to the outside of the curve?
Because you are traveling in a straight line and inertia wants to keep you going in a straight line
A small truck filled with potatoes traveling at 20mph has more momentum that a 3,000 lb car traveling at the same speed
As momentum increases so does the potential for lots of damage in a collision
A 50 lb passenger traveling in a vehicle going 30mph will have momentum.
No matter how strong that passenger may be, he will not be strong enough to stop the body’s momentum when the vehicle comes to an abrupt stop during a crash!
When two objects collide, 3 factors determine how much force there will be on impact
When a collision stops a vehicle in a very short time the impact will be greater than if it took a longer time to stop
Friction is the force when two surfaces move against each other and one surface resists the other
The amount of friction between the surfaces depends on:
1. Static: The holding force between 2 surfaces
2. Sliding: Friction that slows down a sliding object
3. Rolling: Friction between the ground and tire/wheel
4. Internal: Friction that occurs from resistance to motion within elastic objects
Friction creates TRACTION
Only four small areas underneath each tire holds the vehicle on the road!
When the car is not moving, it’s got GREAT (static) traction!
In a hard braking situation, most of the traction is needed for braking
Add hard steering will result in loss of control
As the car enters a turn, inertial wants to keep the vehicle and occupants going straight
The seat position and seat belts hold the passengers in place through the curve
The design balance for a vehicle is only reached when the vehicle is not moving, or is moving in a straight line at a constant speed
As soon as the vehicle accelerates, brakes, or turns, the vehicle balance is changed
As soon as motion occurs, weight transfer on the tires changes the size of the tire patches
Going up or down a hill, or around a corner, or BOTH at the same time, really puts physics into play!
Load capacity includes the combined weight of people and cargo that the vehicle is designed to safely handle
Properly inflated tires not only increase traction, they improve gas mileage and save you money!
Tires with plenty of tread help maintain traction!
A good suspension system helps keep the tires on the road, maximizing traction!
1. Car hits object
Body into steering wheel, dashboard, other passengers, etc.
There’s no airbag inside the skull! If the person lives, the result can be severe brain damage.
Gases Vent Opening
Air Bags in Dash or Steering Wheel
Wear Your Seatbelt!
In the front AND back!