Direct wartime imports from Sweden provided about 15% of all British ball bearings.
Did Swedish ball bearings keep the second world war going?
This paper examines the Swedish ball bearings industry during the Second World War, including subsidiary operations in Germany and the United Kingdom. It determines that these ball bearings were very important to the war effort in both countries, comprising in total about 58% of German supplies and 31% of British.
Why were ball bearings so important in WW2?
German bearing manufacturers had a long history of manufacturing bearings in Schweinfurt, and their production during World War II made them a target for American bombings. Bearings were a vital component in the tanks, airplanes, machine guns, heavy artillery, and submarines used by the belligerents during the war.
How did Britain contribute to WW2?
British forces played major roles in the production of Ultra signals intelligence, the strategic bombing of Germany, and the Normandy landings of June 1944. The liberation of Europe followed on 8 May 1945, achieved with the Soviet Union, the United States and other Allied countries.
What role did Sweden play in WW2?
For the Allies, Sweden shared military intelligence and helped to train soldier refugees from Denmark and Norway, to be used in the liberation of their home countries. It also allowed the Allies to use Swedish airbases between 1944 and 1945.
Why are ball bearings important?
A ball bearing is a type of rolling-element bearing that serves three main functions while it facilitates motion: it carries loads, reduces friction and positions moving machine parts. Ball bearings use balls to separate two “races,” or bearing rings, to reduce surface contact and friction across moving planes.
Why was Schweinfurt bombed?
The American bombers conducted a strategic bombing raid on ball bearing factories to reduce production of these vital parts for all manner of war machines. This was the second attack on the factories at Schweinfurt.
What is a ball bearing factory?
Quote from Youtube video:It has steel balls that move inside tracks called raceways the raceways are carved into a set of heavy-duty steel rings the balls are made of the same type of steel.
When was Schweinfurt bombed?
The Schweinfurt–Regensburg mission was a strategic bombing mission during World War II carried out by Boeing B-17 Flying Fortress heavy bombers of the U.S. Army Air Forces on August 17, 1943.
Schweinfurt–Regensburg mission.
| Date | August 17, 1943 |
|---|---|
| Location | Schweinfurt and Regensburg, Germany |
| Result | German victory |
What was the German target on August 17 1942?
Arming wire tag from one of the bombs dropped by the Eighth Air Force in its first heavy bomber raid against Nazi-occupied Europe, against the Rouen-Sotteville railway yards in France on August 17, 1942.
What does Schweinfurt mean in German?
Schweinfurt (in German literally ‘swine ford‘) is a city in the Lower Franconia region of Bavaria in Germany on the right bank of the navigable Main River, which is spanned by several bridges here, 27 km northeast of Würzburg.
Why does the United States decide to bomb Germany during the day?
German Air production kept on rising during this period thus the fear was that the German would produce ever more planes to defend their skies. The Americans decided they would strike deep into Germany and attack a crucial ball bearing factory as well as a Messershmidt plant both deep in Bavaria.
Where was the German ball bearing factory WW2?
city of Schweinfurt
The city of Schweinfurt, located in central Germany, was the center for the production of ball bearings during WW2, a characteristic that remains true until today.
What is ball bearing in friction?
Ball bearings reduce friction by using smooth balls lubricated with oil or grease that freely roll between a smooth inner and outer surface. The main concept of the ball bearing is that objects that roll past each other produce less friction than if the objects were sliding against each other. Physics.
When were ball bearings invented?
1794
Philip Vaughan received a patent for a ball bearing in 1794, and his design became the basic blueprint for the creation of the modern ball bearing.
What do you understand by ball bearings How do ball bearings reduce friction?
Ball bearing reduce friction because they roll rather than slide. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.
What is the role of ball bearings in reducing friction explain?
Bearings reduce friction by means of a rolling motion
Bearings reduce friction by means of this rolling motion. The “rolling bearing”, with its rolling motion, reduces friction more than the “plain bearing” with its sliding motion, allowing for a greater decrease in the amount of energy consumption during rotation.
How do ball bearings increase the efficiency of many machines?
To sum it up, ball bearings are effective in reducing friction between the moving parts of a machinery by using simple physics: replacing the sliding friction with rolling friction. These improve both the linear or rotational motion around a fixed axis.
How do ball bearing reduce the sliding friction Class 8?
Answer: A ball bearing works on the principle that rolling friction is less than sliding friction. It helps in reducing friction between two surfaces in contact and maintaining separation between the bearing races, thereby allowing minimal surface contact between two surfaces.
How ball bearings reduce friction write any two examples when increasing friction comes to our advantage?
The ball bearing reduces the friction by converting sliding friction into rolling friction. For example, when the axle of a machine fitted with the ball bearing rotates, then the metal balls also roll and hence, the friction is reduced.
What are the methods to reduce friction?
Methods for Reduction friction:
- Make the surfaces little more smoother. …
- Lubrication is another way to make a surface smoother. …
- Make the object more streamlined. …
- Reduce the Normal force acting between the surfaces in contact. …
- Reduce the contact between the surfaces, so that less number of bonds will be formed.
How is rolling more efficient than sliding?
As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction. Rolling friction is the resistance to motion experienced by a body when it rolls upon another. It is much less than sliding friction for the same pair of bodies.
In which case do you need smaller force Why?
Answer: The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction. Rolling friction is the resistance to motion experienced by a body when it rolls upon another.
How does a lubricant reduce friction?
The lubricants spread over the irregularities on the surface that makes the contact. So, the contact between the lubricant and the moving objects reduces the friction.
Why sliding is replaced by rolling in most of the machines?
The sliding is replaced by rolling in most of the machine because in sliding the friction or frictional force is greater than rolling due to this reason the machine does not move easily and consume more energy but in rolling the friction is more and more less than sliding and its moves very easily and its consume less …
Why is friction called a necessary evil?
Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. … But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil.
What is it called when one body rolls the surface of another body the resistance to its motion?
When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction.
Can we eliminate friction completely?
Frictional force cannot be eliminated completely because of the presence of microscopic plowing that occurs even with the undulated surface. The friction coefficients obtained with the undulated surfaces without lubricants were as low as those found in boundary lubrication of flat surfaces.
Why is it difficult to move on wet floor?
A smooth and wet floor does not provide sufficient friction required to walk smoothly. So it is difficult to walk on such surfaces.
Do liquids provide more friction than gases?
As a consequence, the electrostatic force in liquids is larger than in gases. So, the frictional force in liquids is larger than in gases.