Dakle ove nedelje odgovarate na sledeća pitanja
1. Kako glasi zakon održanja impulsa (recima i formulom)?
2. Kakvo kretanje nazivamo reaktivnim kretanjem? Navedite primere
3. Kako glasi zakon održanja mehaničke energije (zakon održanja energije u mehanici? (rec ma formulom)
- Ste je to druga kosmička brzina i koliko iznos?
nemate u ovom materijalu) Sta je prva kosmička brzina i koliko iznos?
6. sta se podrazumeva pod sudarom u fizici i kakvi mogu biti sudari (ukratko objasniti svaki od njih moze i kroz primere?
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temp rises, and expansion

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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