SEN 2743 Newton rides his Bike at Lost Hills
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Newton rides his Bike at Lost Hills
1. Newton 1, 2, 3, and 4
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In answer to Gil Morris's question, the answer is yes it takes energy to reverse the direction of the piston and connecting rod. If a body is moving in a straight line, an outside force is needed to change its direction and/or speed. The piston has to stop movement in the 'down' direction and then start movement in the 'up' direction. F = M*A
Under the misquote of Sir Isaac's first law, the question of efficiency of a reciprocating piston F1C motor is raised. Since there's a swept volume limit, a non-reversing piston motor gets one stroke so the reciprocating piston is massively more efficient.
From aram schlosberg
Newton’s first law and efficiency
The first Newtonian law of motion applies to bodies moving linearly, rotating bodies or their combinations in a vacuum, without gravitational forces. The rotating part of an engine is the crankcase and prop. The whole model can move linearly.
Under these conditions, the rotating speed of the crankcase and the prop as well as the direction the model is moving are preserved forever. The piston and connecting rod are redundant.
But with air, friction and gravity the piston and connecting rod are required to convert repeated fuel combustion in a cylinder (via an up and down linear motion) into rotating the crankcase and prop - retaining the trust to keep the model in the air with enough lift to balance its weight.
An engine’s efficiency is the way to achieve this with the least amount of fuel or given the amount of fuel, retain the highest rpm. In short, efficiency only matters in the real world. ///
RE Newtonian Trivia: The answer is no. Efficiency is about energy.
Newton's law is about force. Two different things, often confused.
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