The resistance a surface or object encounters when moving over another.
0
votes
2answers
130 views
Why is simple harmonic motion called so?
Is the motion of a simple pendulum, a simple harmonic motion? It stops vibrating after sometime.
0
votes
0answers
54 views
Work done by friction (homework) [closed]
A 40 kg case is pushed across a floor at a steady speed of 1.5 m/s. When the pushing stops, the case slides a further distance of 1.2m before coming to rest. Calculate the frictional force acting on ...
0
votes
0answers
45 views
Work, energy and friction [closed]
A car loaded with bricks has a total mass of 18kg and is pulled at a constant speed by a rope. the rope is inclined 30 degrees with above the horizontal, and the cart moves 20.0 m on a horizontal ...
0
votes
1answer
104 views
Determining the frequency of a ruler laying on two spinning cylinders [closed]
I am stuck on this homework problem. Any help would be appreciated, even if it's a push in the right direction.
A ruler of mass m = 75g and L = 3.0 meters is placed so that it is exactly balanced ...
0
votes
0answers
38 views
Why do bigger tires = more friction? [duplicate]
Possible Duplicate:
Why do people recommend wider tyres in car for better road grip?
Static/kinetic friction says that the friction force is proportional to the normal force, via the ...
0
votes
0answers
74 views
Describing the movement of the object in a particular situation in Lagrangian way
Suppose there is a object M, (sliding motion) moving by the initial speed $v$ and the initial location $x_0$. Otherwise noted, friction is assumed to be nonexistent. It then meets a circular mold ...
0
votes
0answers
21 views
Helpful tutorials on force [duplicate]
Possible Duplicate:
List of good classical physics books
I'm having a hard time understanding force in my highschool AP physics class, i looked through youtube but without luck. Could ...
0
votes
0answers
541 views
Capstan equation [closed]
This problem is from An Introduction To Mechanics book, chapter 2, problem #24.
A device called a capstan is used aboard ships in order to control
a rope which is under great tension. The rope is ...
0
votes
0answers
67 views
How to control heavy ball in x and y direction? [closed]
I'm trying to build a device that holds a rather heavy ball and I want to be able to control it's "movement" in the X and Y directions (they are horizontal as well as orthogonal).
My current ...
0
votes
0answers
107 views
A problem on mechanical energy and friction
I'm studying for a mid-term, and I'm trying to solve some mock-papers. The following are two problems which I have solved, but I'm missing a part:
$(1)$ A body of mass $ m_1= 8 \rm kg$ passes ...
0
votes
0answers
108 views
Load vs Leverage vs Friction on a floating pivot [closed]
If I had a standard 'cherry-picker' type of crane (lifting device), 7' high, with a 7' boom, suspending 1000# at its end,its vertical support mounted atop a 6" diameter ball-type pivot: how much force ...
0
votes
1answer
160 views
Deceleration of Vehicle off pavement
How would I calculate the deceleration of a vehicle (ATV), wheels locked, on dirt? How long would it take to halt? How fast is it decelerating?
I used this calculator, but it seems incorrect for a ...
0
votes
0answers
303 views
Newton's 2nd law (f=ma) to derive an expression for the resultant force on the block [closed]
A block. initially at rest , slides down a slope as shown. the frictional force is calculated to be 160N and the air resistance is 0.5v, where v is the velocity of the block.
if the weight acting down ...
0
votes
0answers
349 views
Reynolds Number and relation to Moody Diagram for a Small Pipe
I am having the following problem on a lab write up:
Calculate the approximate distance downstream of the inlet that
corresponds to the hydrodynamic entry length for Reynolds numbers of
3,000 ...
0
votes
0answers
465 views
Physics tension question [closed]
Two blocks are pulled across a frictionless surface by a $240\ N$ force, as shown in the diagram below: $60\ kg$ - - - cord - - - $20\ kg$ → $240\ N$. If the blocks are accelerating at $3\ m/s^2$ what ...
-1
votes
4answers
294 views
Whats wrong with this perpetual machine?
Consider a cube of mass M resting on a rough surface such that the coefficient of friction between the cube and the surface is K. So in order to just slide the cube I need to apply a minimum force of ...
-1
votes
2answers
617 views
Investigating damped Harmonic Motion in a Spring?
I'm going to conduct an investigation into the dampening of a spring.
Essentially, what specific factors could be investigated? Currently I'm planning to investigate the effect of changing the mass ...
-1
votes
1answer
267 views
How much friction is caused by a 10x10 cm window on the side of an airplane?
Say that the airplane is going in 1000 km/h. On the side of the airplane, there is a 10x10 cm window. How much friction would this window cause. For the sake of the calculation, imagine that the ...
-1
votes
1answer
51 views
Comparing Static Frictions
In this figure, which of the static frictional forces will be more?
My aim isn't to solve this particular problem but to learn how is static friction distributed . Since each of the rough-surfaces ...
-1
votes
1answer
122 views
Find largest angle
The two homogeneous bars AB and BC are connected with a pin at B and
placed between rough vertical walls. If the coefficient of static friction between
each bar and the wall is 0.4, determine the ...
-1
votes
1answer
377 views
please help with a friction problem! [closed]
My Problem is the #120 in this page (someone please edit and rotate this image, bcause i don't know how to rotate it):
http://i.stack.imgur.com/fBn9C.png
It is a regent practice question,any help ...
-2
votes
2answers
189 views
What is a natural movement of a ball on a upward curve (the two arrow lines pointing upward) given no external force?
If you drop a ball down a upward curving parabolic ramp, what is the expected movement of the ball? Assume the ball is set into motion with no external force.
Would it go all the way from point A to ...
-2
votes
0answers
67 views
Man ,Pulley, block system? [closed]
In the figure $m_{A}=m_{B}=m_{C}=60 kg$. The coefficient of friction between $C$ and ground is $0.5$, $B$ and ground is $0.3$, $A$ and $B$ is $0.4$. $C$ is pulling the string with the maximum possible ...
