centripedal force of impact speed of car weight of car impact distance reducing force of impact –...

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

• 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 BANKFRICTION TRACTION INERTIA

CENTER OF GRAVITY SPEED WEIGHT

FORCE OF IMPACT TOTAL STOPPING DISTANCE

BRAKING DISTANCE BANKED CURVETREAD

CENTRIPEDAL