A- level Physics coursework on rowing

Physics Coursework

Physics of rowing

Propulsion

A ride accelerates through the action/reaction principle (Newtons third gear law). You move water one way with your oar; the boat moves the new(prenominal) way. The momentum (=mass*velocity) you put into the water will be equal and opposite to the momentum acquired by the boat.

Consider a boat before and after a shooting.

PIC 1

Before the stroke, total momentum p = 0, since everything is at rest.

After the stroke, total momentum: p = mbvb ¡V mwvw = 0 because the total momentum cant change (Newtons second law).

During the normal stroke (i.e. with the boat already sorrowful) it is less obvious that water is locomote backwards in order to keep the boat moving forwards, since the blades appear to lock in where they ar placed, but if you look at the puddles when the blades are extracted its clear that water is moved. There has to be whatever slippage in order to accelerate the boat, although, from energy considerations, this should be do as small as possible. So what about if you zip off the bottom of the river, or a series of poles lay along the riverbank, rather than the water? Well, in that case the unhurt planet moves backwards instead, and some slippage still occurs.

Resistance

Bodies moving in liquid slow down due to resistive forces cognise as drag. This actually represents the transfer of momentum from the body to the fluent: the surrounding fluid speeds up as the body slows down, so total momentum still remains constant. For boats, there are various types of drag:

h Skin Drag, due to corrasion between the hull entraining water along with the hull

h function Drag, due to turbulence created by the passage of the hull

h fly high Drag, due to energy lost in...

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