Work is done by the force of gravity on the bike?

AI Thread Summary
The discussion centers on calculating work done by gravity and by a force when pushing a bicycle and a stalled car. For the bicycle, the key formula involves the gravitational force component acting along the incline, which can be derived from the mass, incline angle, and distance. In the case of the car, the work done can be calculated by integrating the varying force over the displacement, represented graphically in a force-displacement diagram. Participants emphasize the importance of understanding the definition of work and the appropriate formulas to apply in each scenario. Clarification on these calculations is sought to resolve confusion.
geroallynne
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I need help badly!

1. A bicycle rider pushes a bicycle that has a mass of 13 kg up a steep hill. The incline is 25* and the road is 275 m long. The rider pushes the bike parallel to the road with a force of 25N. How much work is done by the force of gravity on the bike?

2. Your car has stalled and you need to push it. Suppose for the first 15 m, your force decreased at a constant rate from 210-40.0N. How much work did oyu do on the car? Draw a force-displacement graph to represent the work done during this period.


Please help me. i am in need!
 
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geroallynne said:
1. A bicycle rider pushes a bicycle that has a mass of 13 kg up a steep hill. The incline is 25* and the road is 275 m long. The rider pushes the bike parallel to the road with a force of 25N. How much work is done by the force of gravity on the bike?

2. Your car has stalled and you need to push it. Suppose for the first 15 m, your force decreased at a constant rate from 210-40.0N. How much work did oyu do on the car? Draw a force-displacement graph to represent the work done during this period.


Please help me. i am in need!
You need to know the definition of work. Can you state what it is as you understand it?
 
In these two questions, mainly the first i don't understand which formula to used. the ones that i have are W = Fd and W = fdcos* <-- theta..
and in the second question, i don't understand which formula to use either.
Thank you for your help
 
geroallynne said:
In these two questions, mainly the first i don't understand which formula to used. the ones that i have are W = Fd and W = fdcos* <-- theta..
and in the second question, i don't understand which formula to use either.
Thank you for your help

For the first one, which component of gravity does work along the path?

As for the second one, do you have any idea how you could calculate the work from the force-displacement diagram?
 
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