If the ISS orbits the Earth every 90 minutes, how many times will an ISS astronaut see the Sun rise in 24 hours?
How Does a Rocket Work? When a spacecraft is launched:
1. The fuel in the tanks is ignited and explodes, colliding with the walls of the tank at high speed.
2. The tank exerts a force on the fuel, pushing it out through the exhaust pipes.
3. The fuel exerts an equal and opposite force on the rocket, driving it forward.
This is an interaction pair of forces. Model rocket
A balloon attached to a straw can be used as a model to show how a rocket works. A student set up the model as follows:
String held at two points Straw Clothes peg Inflated balloon z 1. Predict what happens when the clothes peg is removed. Explain your prediction.
2. Set up this model in the school laboratory. Remove the clothes peg and record your observations.
3. Explain why your predictions did or did not match your observations. 4. Sketch a diagram of this equipment and use arrows to show the forces involved.
Tweet an astronaut Your class must send a tweet to an astronaut about life in space. Complete the task as follows:
1. Make contact with the astronaut you want to question. You could contact Chris Hadfield (@Cmdr_ Hadfield) or other astronauts such as @astro_reid, @astro_luca, @astro_ken or @astro_ron.
2. Come up with a hashtag that describes the task and your class. For example, #SpaceLife2BSci 3. Look for some tweets and replies that the astronauts have posted describing life in space. 4. Create a collage of the astronaut’s quotes and include a summary of what life is like in space.
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Fig. 26.1.4 Model set-up
Learn more about interaction forces in Physical World 17.3
