Question

Which of the following exerts force on the ground, when a bicycle is moving ? a) Pedals b) Back wheel c) Front wheel d) Both the wheels

Answer 1

Friction opposes whatever happens in a friction-less environment"

If there were no friction at all, pedaling a bicycle will get you nowhere. The wheels would spin at their locations whilst the cycle and the rider still remain in the same position. But in reality, friction opposes the state of being stationary and gets you moving - in the "Forward direction" (It literally pushes you forward)
--------------> Friction acts in the forward direction (OVERALL)

What if only the back wheel had no friction ? You would still be stationary.
-------------> Friction acts in the forward direction (Back-wheel)

What if only the front wheel had no friction ? You would be pedaling away with much ease in the forward direction ! (The back wheel would rotate while the front wheel just skids)
-----------> Friction acts in the backward direction (Front wheel)

Now the frictional force on the backward wheel has to be greater than the one on the forward wheel for the overall frictional force to be in the forward direction and the bicycle to move forward.

Hope I made sense


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Answer 2

I think the back wheel