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Simplicity is the ultimate sophistication. ..."da Vinci (1452-1519, Italian artist, sculptor, painter, architect, engineer and scientist) "

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 Author Topic: Force on front and rear tires are in opposite direction?  (Read 9777 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
Fu-Kwun Hwang
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 « Embed this message on: March 10, 2007, 04:22:12 pm »

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The following applet simulated a front wheel drive car.
The engine provide power which drive the front tires rotate in the forward direction.
Due to friction force, front tires push ground backward,at the same time, ground push front tires forward. So the force on the front tires are in the forward direction.

However, the rear tires have to rotate with the front tires in the same rotation direction.
So the ground has to provide a back-ward push on the tire to make the rear tires rotate in the same direction as front tires.
If those two force are equal in magnitude but in oppositive direction, then, the net force on the car should be zero? Why the car can move forward?
What do you think about the above arguments?  What is wrong?

Think about it.

Use mouse to turn on power check box, the car will star to move.
The drag force is assume to be in the form as Fb=-b*vx;
Red arrow shows the velocity. You can change the engine power with slider and turn on/off the power with checkbox.

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Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME
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Simplicity is the ultimate sophistication. ..."da Vinci (1452-1519, Italian artist, sculptor, painter, architect, engineer and scientist) "
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 Related Topics Subject Started by Replies Views Last post Velocity in the same direction of the friction force! Dynamics Fu-Kwun Hwang 5 27612 July 14, 2007, 08:47:24 am by Fu-Kwun Hwang Normal forces on front and rear tires when car is accelerated! Dynamics Fu-Kwun Hwang 0 14764 March 10, 2007, 06:52:36 pm by Fu-Kwun Hwang Normal forces on front and rear tires when car is accelerated! dynamics ahmedelshfie 0 3469 May 05, 2010, 12:54:18 am by ahmedelshfie Force on front and rear tires are in opposite direction? dynamics ahmedelshfie 0 5421 May 26, 2010, 11:57:20 pm by ahmedelshfie Velocity in the same direction of the friction force! dynamics ahmedelshfie 0 3774 June 03, 2010, 02:17:18 am by ahmedelshfie
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