- #1
davon806
- 148
- 1
Weird!? About the direction of rotation of wheels
Suppose we consider a car moving on rough road in forward direction, wheels rotating clockwise.
Since wheels rotate clockwisely they will push road backwards so friction acts forwards i.e. in direction of motion of car.The car will move, because the only external horizontal force on it is the actual friction force.
Please see the following website:
From 0:29 to 0:34,it is clear that the left front wheel rotate clockwisely but the car is accelerating forwards
However,please also see this video,
http://www.youtube.com/watch?v=VCpPPVvGqTY&feature=related
From 2:11 - 2:14
The car accelerates from rest,this time the left front wheel rotates anticlockwisely.
Why?If the wheel push the road forwards,the road would push the car backwards.
Moreover,please see the last video,it is about bicycle.
From 0:30 - 0:40,
a bicycle wheel would rotate in the same direction of the displacement of bicycle.
Similarly,why?Shouldn't the wheels rotate in the opposite direction of displacement according to Newton's 3rd law)
Suppose we consider a car moving on rough road in forward direction, wheels rotating clockwise.
Since wheels rotate clockwisely they will push road backwards so friction acts forwards i.e. in direction of motion of car.The car will move, because the only external horizontal force on it is the actual friction force.
Please see the following website:
From 0:29 to 0:34,it is clear that the left front wheel rotate clockwisely but the car is accelerating forwards
However,please also see this video,
http://www.youtube.com/watch?v=VCpPPVvGqTY&feature=related
From 2:11 - 2:14
The car accelerates from rest,this time the left front wheel rotates anticlockwisely.
Why?If the wheel push the road forwards,the road would push the car backwards.
Moreover,please see the last video,it is about bicycle.
From 0:30 - 0:40,
a bicycle wheel would rotate in the same direction of the displacement of bicycle.
Similarly,why?Shouldn't the wheels rotate in the opposite direction of displacement according to Newton's 3rd law)
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