Calculating Force of Friction on a Bicyclist

AI Thread Summary
The discussion revolves around calculating the force of friction on a bicyclist and the total force exerted by the road on the bike. A participant seeks to determine the value of the retarding force constant 'b' for a particle with a given mass and terminal speed, but their initial calculation of -4.905e-08 kg/s is deemed incorrect. Additionally, when analyzing a bicyclist traveling in a circle, the participant incorrectly assumes that the total force is simply the sum of the friction force and the normal force, leading to confusion over the correct approach. It is clarified that since force is a vector quantity, the normal force and friction cannot be directly added due to their differing directions. The discussion highlights the importance of understanding vector addition in force calculations.
ViewtifulBeau
Messages
50
Reaction score
0
with a terminal speed of 0.2 mm/s. The particle has a mass of 10^-10 g and a retarding force of the form bv. What is the value of b? i converted everything to SI and i got -4.905e-08 kg/s but it is wrong.. am i close?

another question...

A bicyclist travels in a circle of radius 26 m at a constant speed of 7.44 m/s. The combined mass of the bicycle and rider is 95 kg.

The force of friction exerted on the bike from the road is 202 N but i need to find the total force exerted by the road on the bike. I thought it would be 202 + mg (normal force) which would be 1130. but that is not right. then i tried just normal force so i did 95 * 9.81 and i got 932. and that is wrong too!
 
Physics news on Phys.org
2nd part: I may be wrong here, but because force is a vector quantity, and since the normal force and friction do not act in the same direction, you cannot simply add to find the total force.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »
Thread 'Trying to understand the logic behind adding vectors with an angle between them'

Thread 'Trying to understand the logic behind adding vectors with an angle between them'

My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Coefficient of kinetic friction of a block sliding across the ceiling
Replies
7
Views
1K
A cylinder connected to a hanging mass
Replies
21
Views
375
Is friction really always related to the normal force?
Replies
5
Views
2K
Coefficient of Friction question for a cart going down a wooden ramp
Replies
18
Views
3K
How Is Heat Generated from Friction in Physics Problems?
Replies
6
Views
1K
Calculating Forces on a Motorcycle Riding in a Transparent Sphere
Replies
5
Views
2K
Constant frictional resistance & retardation
Replies
6
Views
1K
Calculating Force to Push Steel Rod Up 50 cm
Replies
24
Views
3K
Freewheeling bicycle and friction
Replies
6
Views
3K
Friction force on an inclined plane
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top