Determining distance of travel with friction acting on a car.

AI Thread Summary
A car traveling at 51 mi/h on a wet highway with a static friction coefficient of 0.102 needs to determine the minimum stopping distance. The discussion highlights the use of kinetic equations and the relationship between friction and motion. Participants express confusion over the lack of mass and acceleration values in the problem, complicating the calculation of stopping distance. A free body diagram is mentioned, noting that it becomes more useful once the mass is recognized as canceling out in the equations. Ultimately, understanding the forces involved, including weight, normal force, and friction, is crucial for solving the problem.
quinntan
Messages
3
Reaction score
0
1. A car is traveling at 51 mi/h on a horizontal highway. If the coefficient of static friction between the road and tires on a rainy day is .102 what is the minimum distance in which the car will stop.



2. f=un f=ma kinetics equations



3. No idea here. Teacher barely skimmed over friction so far and all problems we have done in class either had a value of acceleration, a mass or a force. This one has none of those.
 
Physics news on Phys.org
can u imagine what will happen to the car?
 
I know it will stop eventually but I don't know how far it will go. I made a free body diagram but it wasn't very useful without knowing the cars mass.
 
quinntan said:
I know it will stop eventually but I don't know how far it will go. I made a free body diagram but it wasn't very useful without knowing the cars mass.

In your free body diagram, do u have these 3 forces:

the weight od the car, the normal force exerted by the ground, and the friction force? :)
 
Alright I got it. It turns out that the masses cancel.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Distance travelled by a car considering only air friction?
Replies
4
Views
2K
Cars rounding a slippery banked corner in the rain
Replies
20
Views
3K
Stopping distances on a downward slope
Replies
3
Views
2K
Frictional Forces and Stopping Distance in Physics
Replies
1
Views
2K
Car Crash Analysis: Analyzing Friction & Speed
Replies
9
Views
4K
How to find coefficient of friction *Without* mass?
Replies
3
Views
22K
Is the Hertzian Contact Model Suitable for Simulating Car Braking on Wet Roads?
Replies
4
Views
2K
Will a Car Skid? | Friction and Centripetal Acceleration
Replies
5
Views
4K
How Far Will a Car Travel Before Stopping Without ABS at 115.2 km/h?
Replies
5
Views
2K
Solving for the friction without mass
Replies
18
Views
3K

Hot Threads

Recent Insights

Back
Top