You drop the ship

Big Bang HTL 1, textbook

s4ex8u Selected phenomena 39 Newtons times three 6 You can look at this principle from another perspective. If an elevator suddenly falls free (F3), then the car and everything else in it will plunge into the depths with the same acceleration, precisely because the inert and heavy mass of all objects are the same size. Therefore you would feel completely weightless in the elevator, like an astronaut in orbit around the earth. Info: Zero g | Cape. 5.1, page 33 Experiment: Drop tower Summary Every object has a mass which, depending on the situation, is noticeable as a heavy or an inert mass. With every object, “both” masses are exactly the same. This is called the equivalence principle. Z Drop tower In Bremen - unique in Europe - there is a drop tower (Fig. 6.4), which is used by the European Space Agency (ESA) for experiments in weightlessness. It's much cheaper than space missions. The fall distance is around 100 m and the fall time is therefore around 4.5 seconds. With a catapult, you can also use the uphill section, which gives you 9 seconds of weightlessness. With a very simple experiment you can check the effect of weightlessness in free fall. To do this, fill a plastic bottle with water and make a hole at the bottom of the side. The water jet flows out in the form of a trajectory parabola (6.4. Right). Now what happens if you drop the bottle? Set up your hypothesis before the experiment and then try to prove it. The fall distance should be a few meters and it is convenient to record the experiment on video. e Fig. 6.4: Left the drop tower in Bremen. On the right a water bottle with a hole. What happens in free fall? 6.2 In the depths of space The law of inertia This section deals with Newton's first basic law, which is also called the law of inertia. Its consequences extend far into everyday life. If you neglect the friction, a ball will always roll back to the starting height. How far does the ball roll when the track on the right is completely horizontal? The Voyager 1 space probe was launched on September 5, 1977 and was already over 19.5 billion km from Earth on February 22, 2015. She has no propulsion missiles! How long will it fly on: a) 10 years, b) 1000 years, c) 1 million years or d) much longer? You drop a coin on a plane that is flying very fast. Where does this end up? Right under you Or something in or against the direction of flight? Try to justify! And what is it like when you jump straight up on a moving train? In science fiction films, the engines of spaceships often burn nonstop. Why is that physically nonsense? F4 A2 a b c Fig. 6.5 F5 A1 Fig. 6.6: Voyager 1 F6 A2 F7 C2 The basic idea behind what we call the law of inertia today was already in GALILEO. The idea for this apparently came to him when he was looking at a swinging chandelier in the cathedral of Pisa (see Chapter 11.1). A pendulum swings - almost - back to its original height! The friction causes it to be a tiny bit less every time. But this cannot be seen with the naked eye for a single oscillation (Fig. 6.7). For testing purposes only - property of the publisher öbv

Made with FlippingBook