On 12/12/2007 7:18:24 PM, shan29 wrote: >WHY ARE THE CURVES ON A RACE >TRACK NORMALLY BANKED CURVES? ---------------------- The surface of the track must provide a vertical force to balance the weight of the vehicle.
The next factor is that acceleration is the rate of change of velocity. Don't forget that linear acceleration means faster or slower in speed. If the direction of motion is changing, that also is acceleration and requires a force in the direction of the acceleration, as per Newton's second law. Whenever an object is seen moving along the arc of a circle, or a segment of a circle, you can be sure that a force is being applied in the direction of acceleration, i.e., toward the inside of the arc.
By banking the curve, a portion of the normal force of the track on the vehicle not only holds it up in the vertical direction, but provides the force to make the turn and the stated speed. If you take the curve at excessive speed you are counting on static friction between the vehicle and the track to make up the necessissary force. If the track is wet of perhaps sandy, you can slide right over the top of the bank.
--------------------- Physics: Common Sense made Obscure by Mathematics Don Sparlin