Rocket Science. Educational support materials for groups participating in this activity

Transcription

1 Rocket Science Educational support materials for groups participating in this activity This pack contains information designed to support teachers whose classes are visiting the RAF Museum and participating in the Rocket Science Activity. It is intended to provide information and suggestions for class lessons before and after the activity. All the photos and diagrams are available for reasonable reproduction to help with teaching. Contents Page 1. Educational Background 2 2. Activities for the Classroom 8 Pictures 1. V2 Rocket (image and diagram) 5 2. Saturn V Rocket (diagram) 6 3. Russian Rockets (diagrams) 7 Additional images from the RAF Museum s collections can be found online at 1

2 Rocket Science Educational Background to the Rocket Science Activity Links to the Curriculum Rocket Science relates to a number of key areas of the National Curriculum. This section of the teacher resource pack discusses the scientific, historical and social factors which provide a background to the activity. Forces of Flight There are a number of forces which must be considered when designing a rocket. Gravity This a force which attracts different masses together. The strength of gravity is determined by the mass of the objects. The greater the mass of an object the greater the gravitational attraction of the object. The strength of the Earth s gravitational field (when measured at its surface) is 9.81m/s 2. Thrust This is a reaction force which propels an object forward in one direction. It can be calculated using Newton s Laws of Motion. Air Resistance This force is also referred to as drag. It is a frictional force which opposes the movement of an object through air. Air Resistance can be reduced by streamlining an object so that it has less surface area Weight This force is caused by gravity. It is the gravitational force between an object and the Earth. Weight, like gravity is also directly proportional to mass, it is measured in Newtons. Balancing Forces When forces are balanced there is no overall resultant force so an object will remain stationary or travelling at a constant speed because the forces acting on it cancel each other out. When one of these forces is made stronger than the others the object will move in the direction that this force is pushing it. Making one force weaker than the others means that the object will move in the direction that the other forces are pushing. Balanced forces mean there is no change in an object s motion. Unbalanced forces cause the object to move in the direction of the resultant force. 2

3 The History of Rockets Rockets were first invented in China where they were called arrows of flying fire and used as weapons. These rockets were similar to modern fireworks yet even with this type of rocket there were still people who dreamed of travelling to the Moon. According to legend this was actually attempted in China during the 16 th Century. A man named Wan Hoo attached forty seven rockets to a wicker chair, he then ordered his forty seven assistants to light all the fuses simultaneously. When the smoke cleared Wan Hoo and his chair had disappeared. Rockets flares were introduced in 1807 and similar flares are still used today as maritime distress signals or even at football matches. Other ideas experimented with during the 19 th Century included rocket powered cars, sleds and aircraft. Even a rocket postal service was tried out this did not work very well, as the post caught fire. It was not until the Second World War that rockets as we know them today started to be used. Just like their early ancestors these rockets were used as weapons. They were designed by Wernher Von Braun, a German scientist, and used to launch attacks on Britain. This type of rocket was called the V2 and can be seen in the Battle of Britain Hall at the RAF Museum. The V2 was powered by a combustion reaction between Hydrogen Peroxide and Potassium Permanganate. This reaction generated enough thrust to send the rocket from is launch sites in France all the way to Britain. Von Braun s rocket technology was highly sought after and at the end on the Second World War troops from America and the USSR tried to capture as many V2 rockets as possible. They also both tried to apprehend Von Braun and his design team. This would lead to the Space Race. 3

4 The Space Race Rocket technology became increasingly important during the Cold War as America and Russian entered into the Space Race. Russian rocket designer Sergey Korolyov used lots of thrust all in one go in order to get his rockets to achieve the acceleration needed for them to go into space. This technology was very simple to engineer and proved to be quite effective as the Russians were able to launch the first satellite, Sputnik and the first man, Yuri Gagarin into space. They were also the first to land a series of unmanned probes (Luna 1, 2, 5, 7, 8, 9, 13, 16, 17, 18, 20, 21, 23 & 24) on the Moon. The Russian space programme went into decline after Korolyov died in 1966, although the Luna programme did not end until The Americans were using much more complex technology as Von Braun, who had defected to America at the end of the Second World War, was using a development of the technology behind the V2. Von Braun was using thrust at several stages during launch and flight, which allowed his rockets to accelerate for longer. The engineering difficulties that this method caused stopped the Americans being able to achieve a first in space until 1969 when they landed on the Moon. Von Braun s Saturn V rocket which carried the Apollo 11 astronauts to the Moon is the basis of the technology that is used in the Space Shuttle today. The Space Shuttle The Space Shuttle uses thrust in three stages. The first stage is the white, solid fuel booster rockets, which once their fuel is used up are dropped back down to earth using parachutes, making them recyclable. The second stage is the red liquid fuel tank which contains Hydrogen and Oxygen. Hydrogen is used because it is highly explosive and creates a lot of energy when burnt. Oxygen is needed because there is less in the upper atmosphere than on ground level and there is none in space so combustion reactions cannot happen without extra oxygen. The third stage is attached to the shuttle itself and is used throughout the mission to manoeuvre the shuttle. This is particularly important during re-entry. The shuttle has to re-enter the Earth s atmosphere at exactly 40 0 because if the angle is any shallower the shuttle will bounce off the atmosphere like a stone skimming across a pond. If the angle is steeper than 40 0 the shuttle s heat shield will not be able to protect it from the frictional heat generated as it passes through the upper levels of atmosphere. 4

5 V2 rocket being prepared for launch circa Ground crew can be seen working on the nose. Diagram of a V2 rocket. 5

6 Diagram of Saturn V rocket. 6

7 Diagram of Russian rockets. Yuri Gagarin was launched into space using the Vostok rocket, the Voskhod and Soyuz rockets were used to launch the Luna probes and Sputnik was launched using the Sputnik Launcher. 7

8 Rocket Science Activities for the classroom Links to the Curriculum Rocket Science relates to a number of key areas of the National Curriculum. This teacher resource pack is intended to provide some suggestions for classroom activities for a variety of subjects. Science Activities Activity: Which of the rockets made by your class flew the furthest? Discuss why you think this happened. Look at how you could improve your rocket, what would you change and why? Activity: Discuss whether you think that the rocket launching was a fair test or not? Remember that the rockets were released from the launcher with the same amount of force. Research: Your rockets were made out of paper, card and plastic. Find out what materials real rockets are made of. Why do you think these materials are used? Work out what properties these materials have that makes them suitable for rocket design. Activity: Look at rocket fuels, consider the chemical reactions which occur when rocket fuel is burnt. Are the changes reversible or not? What state are the rocket fuels used in? Can you think of any reasons for this? e.g. liquids have lower volumes than gases. 8

9 Maths Activities Activity: What different types of shapes have been used for the wings of the rockets made by your class? Measure the perimeter of these shapes and calculate the area. Activity: Work out what wing shape is the most common in the rockets designed by your class? Use a variety of methods to display your data, in your opinion which shows your results most clearly? English Activities Letter Writing: Write a letter to the person who led your activity or to the Education Team at the RAF Museum, to tell them how you felt about your trip and what you learnt. Instruction Writing: Write a set of instructions on how to make a successful rocket using the materials provided in the activity. Make sure that the instructions are clear and easy to follow. Creative Writing: Write an entry in an astronaut s diary. Think about what it might feel like to travel into space and what things you might experience. Remember that your opinions will vary depending on the time period you astronaut is from. Art Activities Activity: Design your own rocket logo. Look at the designs which are used today. How will you make your logo distinctive? History Activities Research: Find out about the role the V2 rocket played in the Second World War. Try talking to your community s older people; perhaps they may be able to share their memories of the V2. 9