which kind of work is done while swimming? positive or negative?
What kind of work do you think? How do you feel after a swim? Tired? Worn out?
What is our opinion about people posting their homework here? Positive or negative? Explain.
i think its both. + and -.
If you're swimming in standing water (i.e. a pool), then your arms and legs 'push' the water behind you backward, displacing the water backward (and outward as well), so you do positive work on the water. According to Newton's Third Law, the water pushes back on your arms and legs with a force equal in magnitude but in a direction opposite the force your arms and legs apply to the water, thereby displacing you forward, so the water does positive work on you as well.
Replace yourself with a boat and a propellor. Would the motion of the boat through the water allow you to connect a generator to the propellor and charge a battery for ever - or would the boat slow down?
Take this example you stand with a sumo wrestler/fat man on you How do you feel ? Tired? Worn out?
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