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Škola: Gymnázium, Brno, Slovanské náměstí 7Šablona: III/2 – Inovace a zkvalitnění výuky prostřednictvím

ICTNázev projektu: Inovace výuky na GSN prostřednictvím ICTČíslo projektu: CZ.1.07/1.5.00/34.0940Autor: RNDr. Bc. Miroslav HruškaTematická oblast: Dynamics of particles (dynamika

hmotných bodů)Název DUMu: Linear momentum Kód: VY_32_INOVACE_FY.3.04Datum: 27. 9. 2013Cílová skupina: Žáci středních škol s CLIL výukou fyziky v

angličtiněKlíčová slova: Linear momentum, change in linear momentum Anotace: Prezentace slouží k zavedení fyzikální veličiny

hybnost. Na začátku prezentace se opakují první dva Newtonovy zákony.

Dynamics of particles

4. Linear momentum

Zdroj: archiv autora 3

Find words rita neli (adjective)

a blance fotr nici fotr nece a sestre nic saturn let via tygr

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A body is at …… or in uniform ……. …… unless made to …… its …… by …… forces

The …… of a body is directly …… to the net force acting on the body, and inversely …… to its mass

If there are more …… acting on an object, and they are ……, i.e. their …… is a zero vector, then it is the same …… as if …… are no forces at all

Complete sentences

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A car of a mass 1000 kg speeds up with an acceleration of 5 m/s2. A force of resistance of a magnitude 1000 N acts against the motion. Calculate the magnitude of the pull of the engine.

http://www.youtube.com/watch?v=AFnoBrhOR4U 2:42

Exercise I

maF rp FFF

pr FFF

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For a body (a particle) we define linear momentum (hybnost) as the product of its mass and its velocity:

Linear momentum is a vector quantity. Its direction is equal to the direction of velocity

SI unit of momentum, kg.m/s (kilogram metre per second), is a derived unit

Linear momentum I

vmp

vmp

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A car of a mass 1000 kg speeds up from rest with an acceleration of 3 m/s2. Calculate the magnitude of the linear momentum after ten seconds of the motion.

Exercise II

atv mvpp

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If body’s velocity changes from toduring a time interval, then linear momentum changes from to

Change in the linear momentum is

If p1 = p2, does it mean ?

Linear momentum II

11 vmp

22 vmp

2v

1v

vmvvmppp

)( 1212

0p

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If we use the change in the linear momentum, Newton’s second law of motion can be presented this way:

Law of acceleration

There is no acceleration in the formula now… :-)

tp

tvmamF

tpF

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How do we define linear momentum? What do you know about the direction of the linear momentum? What is the unit of linear momentum?

Is it a base or derived unit? Write down the formula of the law of acceleration with use of the change in the linear momentum. Read it

Revision

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Find pairs with similar meanings

assume, turn, catch up, lift,resultant, take effect, deal with,speed up, dependence, aiming,act on, travel, accelerate, study,

overtake, function, suppose,cover, net force, revolution,

heading, elevator, grow, increase

That is all for now

Thank you for your attention

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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, 2004. 288 s. ISBN 80-7196-176-0

Hornby, A. S. Oxford Advanced Learner’s Dictionary of Current English. 5. vyd. Oxford: Oxford University Press, 1995. 1428 s. ISBN 0-19-431423-5

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