Homework Statement
Two blocks are arranged at the ends of a mass-
less string as shown in the figure. The system
starts from rest. When the 1.81 kg mass has
fallen through 0.336 m, its downward speed is
1.25 m/s.
The acceleration of gravity is 9.8 m/s2 .
at is the frictional force...
My physics prof's father died last week, and rather than cancel class, a different prof taught our class (by different, I mean a different one each day). This assignment was emailed to us by the head of the physics department, who spent less than five minutes with the class, and did not explain...
I understand the equation to find the coefficient of friction.
fr = a/b
a -> height of the ramp
b -> length of the base of the ramp.
But i understand that it's also possible to find friction coefficient using angle of elevation of the ramp.
So if i know the angle of elevation and...
Does anybody have a table of rolling friction coefficients? I can't find the one I'm looking for. I have a vertical door opening (similar to a garage door) where there are UHMW polymer rollers rolling in a track. I read somewhere that the coeff of rolling frict would be close to teflon on...
Homework Statement
To calculate the kinetic friction of a block of wood and determine its acceleration by timing it as it travels down a slope. The equipment available consists: of a plank of wood, clamps etc. for raising one end of it to give an inclined plane, blocks to slide down the...
Hi !
Can anyone help me I need help ...
Problem :
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1- A coffee cup on the dashboard of a car slides forward on the dash when the driver decelerates from 40 km/h to rest in 3.5 s or less, but not if he decelerates in a...
okay, i tried searching knietic energy and it won't come up,
soooo here's a questions:
a force of 40 N continues to push a 5 kg box and acclerates it a .70 m/s/s what is the coefficient of friction/
i got the static because it wasn't movingm, but i have no idiea how to get that please...
Homework Statement
Blocks 1 and 2 of masses m1 and m2, respectively, are connected by a light string. These blocks are further connected to a block of mass M by another light string that passes over a pulley of negligible mass and friction. Blocks 1 and 2 move with a constant velocity v down...
Homework Statement
Friction coefficient between an athlete's shoes and ground is 0.9 . Suppose Superman wears these shoes and runs a 50m race.There is no upper limit on his capacity of running at high speeds . Starting from rest, what will be the minimum time before he finishes the race ...
Homework Statement
I have a general question about circular motion of a car on a flat curve.
What must the static friction koefficient be if the car can make the swing by 60km/h?
Thank you,
Homework Equations
- We have to follow Newtons 2nd law.
- Fcentripetal = m*(v^2/r)...
Hey there,
Can you someone explain the "mu" in friction?
I understand that Force=Mass*Acceleration but then it asks for coeffeiencent of friction??
F=u[SIZE="1"]kF[SIZE="1"]n ?
I see it says that F=mg but the friction equalls the constant of the "mu"...the examples in the book are...
Hello, I am student of Master degree about geotecnic here in Chile. So I am traing to solve the next problem.
What happened with static coefficient of friction when the normal pressure increase from zero to very high values.
For any material, Is it the same value of the coeffient of...
Below is a problem I had on a test recently. The task is to find out what the friction coefficient must be in order to prevent the big box from moving. Friction between the little box and the slope is neglected.The red markings are my ideas. I figured if I sum the forces in the x-direction I'll...
Is there a link someone can provide that has a good tutorial on friction coefficient formulas and when to apply them. I seem to be having problems with this topic.
Everyone knows the old M1 and M2 connected by a string and pully question. That is on a level surface. But if the surface is...
I stumbled across this while doing some problems, and wanted to make sure it's true. My teacher isn't great. Physics isn't her specialty, but that's what you get at community college.
Anyways, while trying to find the critical angle at which an object will start to move, I realized that it...
Here it is.
A 10 kg suitcase is placed on a flat ramp inclined at 37 deg. When released from rest, the suitcase accelerates down the ramp at .15 m/s^2. What is the coefficient of the kinetic friction between the suitcase and the ramp?
Now, from this I got Fnet=m*a=1.5 N in the x direction...
Hello! I have this problem I must submit by tomorrow 11 PM and I am getting the wrong answer and cannot figure out what I'm doing wrong. Any help would be great. Here is the problem:
"In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." (See Fig. 5-35.) The...
Here is the problem:
When the jet-powered car "Spirit of America" went out of control during a test drive at Bonnevile Salt Flats, Utah, it left skid marks about 18.70km long. If the car was moving initially at a speed of 661.0km/hr, estimate the coefficient of kinetic friction between the...
A force F is applied on a block of mass m in such a way that it stays in contact with another block of mass M over a frictionless surface. What is the required force for the two blocks to stay in contact? The static coefficient friction between the two block is \mu_{s}.
NOTE: mass m is not in...
I have a test in my physics class early this week, and there are two problems on the review sheet I am having problems getting...both of them having a frictional coefficient...
Here is the first one that I think I understand but the answer I'm getting doesn't exactly make sense...
PROBLEM...
Someone was talking to me about a waterslide. And she said that when the waterslide they would slide a lot faster then if the slide was wet. I was thinking about this, but the only thing i can think of is that the coefficient of friction on dry fiberglass is less then that of water on...