1 Škola: Gymnázium, Brno, Slovanské náměstí 7 Šablona: III/2 – Inovace a zkvalitnění výuky prostřednictvím ICT Název projektu: Inovace výuky na GSN prostřednictvím ICT Číslo projektu: CZ.1.07/1.5.00/ Autor: RNDr. Bc. Miroslav Hruška Tematická oblast: Kinematics of a particle (kinematika hmotného bodu) Název DUMu: Free fall – B Kód: VY_32_INOVACE_FY.2.16 Datum: Cílová skupina: Žáci středních škol s CLIL výukou fyziky v angličtině Klíčová slova:Free fall, Earth, vacuum, uniformly accelerated motion from rest, acceleration due to gravity, air resistance, Galileo Galilei Anotace: Prezentace slouží k procvičení a rozšíření učiva z učebního materiálu Free fall – A, kde je popsána problematika volného pádu těles.

Kinematics of a particle 16. Free fall – B

3 Find words matched with free fall  heart  cumavu  lee frfla  a spi  delati tu  t viagry  guten idol  sestrenica  i ilegal  opel

4 1. After 5 seconds of free fall objects have a speed of about 180 km/h 2. If air resistance is present at a motion, it is not free fall 3. Acceleration due to gravity depends on both the altitude, and the latitude 4. At poles there is the highest acceleration due to gravity True or false?

5 Air resistance  Decide which object does not necessary need air resistance (also called drag) to be able to work properly balloon aeroplane helicopter parachute

6 Exercise + solution I  Calculate the distance of free fall after t = 1 s, t = 2 s, t = 3 s, t = 4 s, t = 5 s. Use the formula {s} = 5{t} 2. Use the results to decide whether a fall from the 3 rd floor of the Eiffel Tower takes less or more than 5 seconds.  We get 5, 20, 45, 80, and 125 metres  The 3 rd floor of the Eiffel Tower is higher than 125 m (276 m) ⇒ more than 5 s.

7 Exercise II  What distance will an object have covered when it reaches a speed of 100 km/h in free fall on Earth? Exercise III  Let’s assume we have dropped a body freely from the third floor of the Eiffel Tower. What minimum time does it take to travel 200 m?

8  Choose one word from the first circle and find a word with similar meaning from the other circle  Which pair is not important for g? Make pairs of words altitude longitude latitude width length height

9 Eppur si muove  Recall what Galileo Galilei studied besides free fall microscope? pendulum? (kyvadlo) inertia? (setrvačnost) stars? | planets? spring? (pružina)

10 Moon (Exercise IV)  On the Moon objects fall with an acceleration of 1.6 m/s 2. Find the speed of a body after it travels 80 m.  a = 1.6 m/s 2  s = 80 m . 10 s . m/s  The speed will be 16 m/s = 58 km/h.

11  Free fall is a …… of freely …… bodies near the …… of Earth in a ……  …… of the acceleration of free fall is …… – downward  g is called acceleration …… to ……  g is less at the …… than at the ……  Galileo …… was the first who …… free fall and found its …… Fill proper words in “……”

That is all for now Thank you for your attention

13  Materiál je určen pro bezplatné používání pro potřeby výuky a vzdělávání na všech typech škol a školských zařízeních. Jakékoliv další využití podléhá autorskému zákonu. Zdroje:  Bednařík, M., Široká, M. Fyzika pro gymnázia, Mechanika. Dotisk 3. vyd. Praha: Prometheus, s. ISBN  Hornby, A. S. Oxford Advanced Learner’s Dictionary of Current English. 5. vyd. Oxford: Oxford University Press, s. ISBN