CENTRIPEDAL
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
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
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
CENTER OF GRAVITY
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
TOTAL STOPPING DISTANCE Three parts of total Stopping Distances Perception time/distance Reaction time/distance Braking Distance
TRACTION
BRAKING DISTANCE What factors can effect braking? CONDITION OF VEHICLE
TREAD
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
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?
WEIGHT AFFECTS ENERGY OF MOTION Cars energy of motion doubles when its weight doubles by load.
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
WORD BANK FRICTION TRACTION INERTIA CENTER OF GRAVITY SPEED WEIGHT FORCE OF IMPACT TOTAL STOPPING DISTANCE BRAKING DISTANCE BANKED CURVE TREAD CENTRIPEDAL