# Homework Help: Work done during swimming

1. Mar 10, 2014

### praveen933

which kind of work is done while swimming? positive or negative?
explain.

2. Mar 10, 2014

### SteamKing

Staff Emeritus
What kind of work do you think? How do you feel after a swim? Tired? Worn out?

3. Mar 11, 2014

### dauto

What is our opinion about people posting their homework here? Positive or negative? Explain.

4. Mar 12, 2014

### praveen933

i think its both. + and -.

5. Mar 20, 2014

### tycoon515

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.

6. Mar 21, 2014

### sophiecentaur

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?

7. Jan 24, 2016

### Rockon

Take this example you stand with a sumo wrestler/fat man on you How do you feel ? Tired? Worn out?