2. CENTRIPEDAL

3. FORCE OF IMPACT Speed of car Weight of car Impact distance
Reducing Force of Impact
Sand canisters break apart on contact
Car features: crumple zones

4. FRICTION HYDROPLAINING
When road is wet, water gets between tire and road
At 55mph, car can lose contact with road if only 1/12 inch of water
HYDROPLAINING

5. INERTIA
Inertia means a body at rest stays at rest, a body in motion stays in motion in a straight line until acted upon by an outside force.
Causes your books on back seat to keep moving forward when you stop
Objects at rest do not move without applied force
Moving objects continue to move in a straight line

6. CENTER OF GRAVITY

7. BANKED CURVE
ENERGY OF MOTION in a curve will try to make it go straight in a curve.
The higher your vehicles speed, the more it will go straight!
VEHICLE CONTROL IN CURVES
SPEED
SHARPNESS OF CURVE
BANKED CURVES
LOAD

8. TOTAL STOPPING DISTANCE
Three parts of total Stopping Distances
Perception time/distance
Reaction time/distance
Braking Distance

9. TRACTION

10. BRAKING DISTANCE
What factors can effect braking?
CONDITION OF VEHICLE

11. TREAD

12. SPEED AFFECTS ENERGY OF MOTION
IF speed doubles, stopping distance increases by an amount equal to the square of the difference in speed.
(Change in speed)2
Original Speed = 15mph
New speed = 30mph
30/15 = 2x faster (change in speed)
2x2 = ________ longer to stop

13. YOUR TURN Figure out how long it will take this truck to stop.
You are driving an empty truck going 25 mph and you decide to stop. It took you 15 ft to stop. You increase your speed to 75 mph. How long is it going to take you to stop?

14. WEIGHT AFFECTS ENERGY OF MOTION
Cars energy of motion doubles when its weight doubles by load.

15. KINETIC ENERGY All objects in motion have kinetic energy
Kinetic energy is energy of motion.
Kinetic energy can be determined by speed and weight of an object.
The faster a car moves, the more kinetic energy it has

16. WORD BANK
FRICTION TRACTION INERTIA CENTER OF GRAVITY SPEED WEIGHT FORCE OF IMPACT TOTAL STOPPING DISTANCE BRAKING DISTANCE BANKED CURVE TREAD CENTRIPEDAL