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youngdee



Joined: 13 May 2012
Posts: 2
Location: Apia Samoa

PostPosted: Sat May 19, 2012 3:11 am    Post subject: concept question Reply with quote

If a car is traveling eastward, can its acceleration be westward? Explain please?
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hepcj
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Joined: 23 Jun 2007
Posts: 125

PostPosted: Mon May 21, 2012 6:40 pm    Post subject: Reply with quote

Well if it is accelerating with negative acceleration or deceleration, then the acceleration vector with be in the opposite direction.
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youngdee



Joined: 13 May 2012
Posts: 2
Location: Apia Samoa

PostPosted: Fri Jun 08, 2012 7:16 pm    Post subject: Reply with quote

If a carís wheels are placed with wheels of greater diameter, will the reading of the speedometer
change?
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hepcj
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Joined: 23 Jun 2007
Posts: 125

PostPosted: Mon Jun 11, 2012 9:28 pm    Post subject: Reply with quote

It depends. Normally, a speedometer will get information about the rotation of the drive shaft and it will be calibrated to work with standard production wheels. If you increase the size of the wheels, then for one rotation the wheel the car will travel further along the ground. So for the same drive shaft speed the car would in fact be travelling faster, but the speedometer would still show the same speed. You could argue that the engine will find it more difficult to turn larger wheels and so for the same power from the engine, the drive shaft would not be able to turn as fast and so the speedometer might read a lower speed.
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