Friction force in this situation.

Well friction in this situation depends on various factor.

1. Load towards the center of pulley. ( The main and most important factor.)

2. Smoothness and lubrication at contact surfaces.

3. Contact area (if contact area is more, friction will be more)

4. Materials of pulley and stationary plate.

If one material is soft and other is hard friction will be less. I prefer pulley or cam is hard and stationary plate which is in yellow colour should be soft. Or you can put some rubber type material at contact area.

5 Curvature or half circular contact. If you use half circular contact instead of line contact friction will be less.

Here I will discuss the main factor load.

Load towards the center will generate opposite direction friction force. Which oppose the rotation of pulley. You might asked me what is the exact value of this opposite load or friction force. I already told you it depends on many factor.

Ok I put 200 kg load on pulleys and try to analysis the situation. You can see 200 kg load divide on two pulleys and apply on each pulley 100 kg load.

This 100 kg further divided in two part one is tangential and second is towards the center. This tangential part will help to rotate pulley and towards the center part will generate opposite frictional force.

Tangential force will be cos30* 100=86 kg because here alpha is 30`

Towards the center force will be sin30 * 100=50 kg.

How to calculate opposite friction force from the value of towards the center force which is 50 kg?

I give you one example just to get overall idea.

What is you car weight may be 1000 kg

Now put your car gear in neutral and try to push it from your hand. You can push it. Your hand has not more than 200 kg power but still you can push 1000 kg weight car with your hand on flat surface remember not on mountain.

I give you another example.

You can see we can slide 100 kg load with the help of 10 kg load. Remember we are not going to lift 100 kg. We just push it. So we have to apply only little more force than friction force.

So the basic thing is if the load towards the center is 50 kg then the opposite friction force ( which oppose the rotation of pulley) will not be more than 5 kg. But still we include some other parameter like your contact area is not curvature, you use less lubrication and make more contact area than considering all this parameter frictional opposite force will not me more than 10 kg.

Mechanism To Increase Energy Efficiency

The Exact value of H1 is the length of curve from point A to point B. You can easily see black curve on cam from point A (Blue dot ) to point B(Blue dot).

Mechanism To Increase Energy Efficiency.

Click on figure for large view. It is about using Cam for increase energy efficiency. Cam are generally used to open and close valve of IC Engine. I am going to show you another use. Left side initial position. Right side final position. Redius of cam continuously decrease.Sliding weight (MG) applied on Cam. With the help of rope weight(MG*Cos(b)) is fixed with cam. We consider b as 45. So cos 45=.70. This fixed weight should be 0.70 MG. Which balance the sliding weight applied on cam in tengential direction. As sliding weight come down the fixed weight go up. But the twist is the redius of cam decrease nominal continuously. So sliding weight come down little bit and fixed weight go up much more. We consider sliding weight come dowm H2 height and fixed weight go up H1 height. We consider H1=5H2
Now we calculate energy loss by sliding weight=MG*Height
=MG*H2
Energy got by lifting fixed weight =MG*Cos(b)*Height
=MG*Cos45*H1
=.70MG*5H2 (Because H1=5H2)
=3.5MGH2
=3.5* Energy loss by sliding weight
So we get 3.5 times more energy than we loss. The ratio depend on the rate we decrease redius of cam and angle (b).

The Exact value of H1 is the length of curve from point A to point B. You can easily see black curve on cam from point A (Blue dot ) to point B(Blue dot).

Stationary hydraulic force can help to rotate pulley.

Stationary hydraulic or spring force can help to rotate pulley.Except pulley all other part in figure are stationary.

Energy Security, Global Warming and Engineering

Research report is attached with this post (Energy security.pdf). You can download it from following link. It is about how we can use engineering to solve energy and global warming problem.
http://mechanicalresearch.info/report.pdf

Stationary Force Can Be Utilized To Do Work.

Before explaining I want to clear some basic things.
v=Velocity. Rate of change in the position of an object
v=dx/dt Meters/Second.
a=Acceleration.
a=Rate of change of velocity.
a=dv/dt =dx/dt2.Meters/second2
Because v=dx/dt
Force (F) = M*a=M*dv/dt=M*dx/dt2 Kg-meters/second2 or Newton.
Work=Force* Distance traveled Newton-Meter.
But what happen when force is stationary or can not travel and object can travel at less than 90` Angel with direction of force.
Answer is "Stationary force will help to move object."
See Figure
There are two pulleys can rotate about their respective axis. Stationary force (MG) applied on pulleys by stationary plate (stationary plate is simply supported on pulleys.). This MG is equally divided and applied on each pulley in vertical downward direction(MG/2). This MG/2 will divided in two parts. one is tangential (MG/2 * Cos (Alpha)) and second is towards the center (MG/2 * Sin (Alpha)). Tangential force will help to rotate pulleys. Towards the center part will generate friction. Still not getting feel free to contact me. (If you want to understand.)
Uses and Advantages:

1. It will decrease manufacturing cost.

2. It will decrease electricity Bill.

3. It will help to reduce green house effect.

4. It provides clean energy.

5. It is cheap and available at every place.

6. It can use for both linear as well as for circular motion also.

7. It will improve quality of people’s life by giving clean and cheap energy.

8. It will help to reduce carbon dioxide in environment.
   

Force analysis ON Off Set Cam.

You know Cam. It is generally used to open and close valve of IC Engine. In offset can the pointer is not towards the center. Now I do only one thing I dont change diameter of off set cam. You can understand by viewing my figure. So force by pointer (Stationary plate ) applied on cam ( without change of diameter, this is special cam.) You rotate that cam in any direction. The force applied by pointer (stationary plate) is same and constant. Now if you rotate cam (without change in diameter) in opposite direction, Stationary force applied by stationary pointer against to its motion, so you have to applied more force to rotate because you have to overcome the force applied by stationary pointer. But If you rotate cam in nearly same direction than it will help to rotate. who help (Stationary force applied by stationary plate or stationary pointer). Whom help ( Cam without change in diameter means pulley.)
To get idea read all post in this blog.
Uses and Advantages:

1. It will decrease manufacturing cost.

2. It will decrease electricity Bill.

3. It will help to reduce green house effect.

4. It provides clean energy.

5. It is cheap and available at every place.

6. It can use for both linear as well as for circular motion also.

7. It will improve quality of people’s life by giving clean and cheap energy.

8. It will help to reduce carbon dioxide in environment.

Mechanism that increase energy efficiency.

As shown in figure two pulleys can rotate about their axis. Stationary plate is simply supported on these two pulleys. Now the weight of stationary plate applied on each pulley in vertical downward direction is Mg/2. This Mg/2 will divided in two parts. One is tangential and second is towards the center. Tangential part will help to rotate pulleys and toward the center part will generate the friction.

Mechanism that increase energy efficiency.

To view figure click on Photos.

As shown in figure sliding plates can slide over fixed plates. Stationary plate is simply supported horizontally on sliding plates. Lubrication is provided at contact surfaces of stationary plate and sliding plates. Weight or load or force (mg) is applied at center of stationary plate. This load is equally divided and applied on each sliding plate in vertical downward direction (mg/2). This mg/2 cos(alpha) helps sliding plate to slide in nearly downward direction.

Force is stationary and it can help to slide the sliding plates at some angle.

Uses and Advantages:

1. It will decrease manufacturing cost.

2. It will decrease electricity Bill.

3. It will help to reduce green house effect.

4. It provides clean energy.

5. It is cheap and available at every place.

6. It can use for both linear as well as for circular motion also.

7. It will improve quality of people’s life by giving clean and cheap energy.

8. It will help to reduce carbon dioxide in environment.

Jigar Y. Patel