If you have ridden a conventional bicycle, you'll have noticed how while standing on the pedals you can force your foot DOWNWARDS for almost the whole depth of the circle traced by the pedals. You stand vertically, so your leg is exerting the main component force vertically downwards. (You do need to exert a small force tangentially to encourage the pedals to continue turning at the top & bottom of the path, but that tangential force is slight and does insignificant work in relation to that of the main downwards thrust.)Daaniyaal said:I figured that the force exerted downwards means half of the circle traced, which would mean that it would be 80 N per 18 centimetres.
Daaniyaal said:Homework Statement
Cyclist pedals downward stroke with 80N of energy. The diameter of the circle traced by his pedals is 36 cm, how much work is done each stroke?
Homework Equations
W=F•d
The Attempt at a Solution
I figured that the force exerted downwards means half of the circle traced, which would mean that it would be 80 N per 18 centimetres. It was not so. does centripetal stuff have anything to do with this?
Work is defined as the force applied to an object multiplied by the distance the object moves in the direction of the force. In this case, the cyclist is applying a force of 80N while pedalling, and the distance the pedals move is the distance the cyclist travels.
The work done by the cyclist can be calculated by multiplying the force applied (80N) by the distance the pedals move. For example, if the pedals move 10 meters while exerting 80N of force, the work done would be 800 joules (80N x 10m = 800J).
Yes, in this context, the work done by the cyclist is equal to the energy exerted. This is because the cyclist is applying a force to move an object (the bike) over a distance, which requires energy.
Yes, the work done by the cyclist can vary depending on factors such as the terrain, speed, and duration of the ride. For example, going uphill or pedalling faster would require the cyclist to exert more energy and therefore, do more work.
Work and power are closely related in cycling. Power is the rate at which work is done, meaning how quickly the cyclist is exerting energy to move the bike. In this scenario, the power output of the cyclist would be 80 watts (80J of work per second) if the distance travelled is 10 meters in 1 second.