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What is direction of friction on front and back wheel of cycle?

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In bicycle, pedalling is done on rear wheel. This means that we try to rotate the rear wheel to move forward. The rear wheel pushes the ground backwards and gets the forward frictional force which pushes the bicycle forward. The front wheel is being pushed forward (through the connecting rod between...
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In bicycle, pedalling is done on rear wheel. This means that we try to rotate the rear wheel to move forward. The rear wheel pushes the ground backwards and gets the forward frictional force which pushes the bicycle forward. The front wheel is being pushed forward (through the connecting rod between the rear and front wheels) which results in the backward frictional force on its tire which rotate it in the same direction as the rear wheel. The static frictional force which acts on both the wheels is a friendly force that helps the bicycle move without loss of energy. Energy loss is due to rolling friction which is backwards on both the wheels. Conclusion: Backward static frictional force (opposite to the direction of motion) on the front wheel and forward static frictional force (in the direction of motion) on the rear wheel. Rolling frictional force is backwards on both the wheels. There will be no kinetic friction on the bicycle unless it skids due to sudden application of brakes or due to muddy and slippery road. As the bicycle tires are moving in the anticlockwise direction, bicycle is moving from right to left. In this case, ( i ) Static frictional force acts on the front wheel from left to right (opposite to the motion of the bicycle) and on the rear wheel from right to left (in the direction of motion of the bicycle). This is a friendly force which helps bicycle move forward and no work is done against it. (ii) Rolling friction acts on both the wheels from left to right (opposite to the motion of the bicycle) and work is done to overcome it. (iii) Kinetic friction is absent as long as the bicycle does not skid. It is from left to right (opposite to the motion of the bicycle) in the case of skidding. If kinetic frictions acts, work will have to be done against it which will result in loss of kinetic energy and hence speed of the bicycle. (iv) There is also the frictional force in the bearings of the wheels which will need more force to accelerate the bicycle and more energy to maintain the speed if the bearings are not sufficiently lubricated. read less
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Tutor

In rear wheel of the cycle the frictional force is in forward direction. This is so, because the driving energy is applied on the back wheel to to push the ground backwards. This makes the front wheel move forwards. Here the friction acts backward and makes the wheel rotate.
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Considering for friction between wheel and road, for a cycle moving forward - The friction would be in forward direction. The wheel wants to rotate and its bottom most part would like to go behind. This would be opposed by the road - hence forward friction
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Native English Speaker with 32 years experience in teaching English and communication skills.

Consider a bicycle first. Pedaling the bicycle (accelerates and) rotates the back wheel in clockwise sense. The velocity of point of contact is therefore backwards. Hence, friction must act forward on the rear wheel. This frictional force causes a translational acceleration of the entire bicycle, including...
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Consider a bicycle first. Pedaling the bicycle (accelerates and) rotates the back wheel in clockwise sense. The velocity of point of contact is therefore backwards. Hence, friction must act forward on the rear wheel. This frictional force causes a translational acceleration of the entire bicycle, including the front wheel. The velocity of point of contact tends to develop in the forward direction. So friction acts in the backward direction. read less
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Tution for Mathematics

Friction always acts opposite to direction of motion.
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Tutor

The rear wheel pushes the ground in backward direction(as paddling is done on rear wheel only) hence it gets a forward friction meanwhile the front wheel is pushed forward and thus gets a backward friction.
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Tutor

Forward on rear wheel and backward on front wheel.
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Let's make learning enjoyable with 9000 hrs of experience

Backward static frictional force on the front wheel and forward static frictional force on the rear wheel. Rolling frictional force is backwards on both the wheels.
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B Tech ( NIT Jamshedpur)

When you paddle then on front wheel forward, back wheel back ward. in slope backward in both the wheels.
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Online Tutor-Mathematics, Science, Competitive Exam Preparation

Frictional force is opposite to the direction of motion.
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