Question

pharam is riding a bicycle. as he pedals, what happens to the motion of the bicycle? why does this happen?

Explanation:

When Pharam pedals a bicycle, the force applied through pedaling causes the bicycle to move forward. According to Newton's second law of motion ($F = ma$), the applied force ($F$) results in an acceleration ($a$) of the bicycle (with mass $m$). The pedaling motion transfers energy (from Pharam's muscular energy to mechanical energy of the bicycle) which overcomes frictional forces (like air resistance and rolling friction) acting against the motion of the bicycle.

Answer:

The bicycle accelerates (its speed increases) as Pharam pedals. This happens because the force exerted by Pharam while pedaling (an external force) acts on the bicycle. According to Newton's second law of motion ($F = ma$), when a net force ($F$) acts on an object (the bicycle with mass $m$), it causes an acceleration ($a$) in the direction of the force. The pedaling motion also provides the necessary energy to overcome opposing forces (like friction) and increase the bicycle's kinetic energy (related to its motion).