1. 'Mele oa boima ba 1-kg o oa ka bolokolohi ho tloha phomolong, ho tloha bophahamong ba 80 m. Ho potlaka ka lebaka la matla a khoheli ke 10 m/s 2. Matla a kinetic ke afe ha 'mele o otla fatše?
Tse tsejoang:
Boima (m) = 1 kg
Bophahamo (h) = 80 m
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Ho batloa: matla a kinetic ha 'mele o otla fatše
Tharollo:
Matla a pele a mechini (ME o ) = matla a khoheli a ka bang teng (PE)
M E o = PE = mgh = (1)(10)(80) = 800 Joule
Matla a ho qetela a mechini (M E t ) = matla a kinetic (K E )
Molao-motheo oa paballo ea matla a mechini :
M E o = M E t
P E = K E
800 = K E
Matla a ho qetela a kinetic ke 800 Joules.
[irp]
2. 'Mele oa boima ba lik'hilograma tse 4 o oa ka bolokolohi ho tloha phomolong, ho tloha bophahamong ba limithara tse 10. Ho potlaka ka lebaka la matla a khoheli ke 10 ms –2 . Matla a kinetic le lebelo la limithara tse 5 ka holim'a lefatše ke eng.
Tse tsejoang:
Phetoho ea bophahamo (h) = 10 – 5 = limithara tse 5 s
Boima (m) = 4 kg
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Ho batloa: Matla a kinetic a limithara tse 5 ka holim'a lefatše le lebelo la limithara tse 5 ka holim'a lefatše
Tharollo:
(a) Matla a kinetic a limithara tse 5 ka holim'a lefatše
Matla a pele a mechini (M E o ) = matla a khoheli a ka bang teng (P E )
M E o = PE = mgh = (4)(10)(5) = 200 Joule
Matla a ho qetela a mechini (EM t ) = matla a kinetic (EK)
M E t = K E
Molao-motheo oa paballo ea matla a mechini o bolela hore matla a pele a mechini = matla a ho qetela a mechini.
M E o = M E t
200 = K E
Matla a kinetic a limithara tse 5 ka holim'a lefatše ke 200 Joules.
(b) lebelo la limithara tse 5 ka holim'a lefatše
Matla a pele a mechini (M E o ) = matla a ho qetela a mechini (M E t )
P E = K E
200 = ½ mv 2
2(200) / 4 = v 2
100 = v 2
v = √100
v = 10 m/s
Lebelo la 'mele ho limithara tse 5 ka holim'a lefatše ke 10 m/s.
[irp]
3. Mango e oa ka bolokolohi ho tloha phomolong, ho tloha bophahamong ba limithara tse 2. Ho potlaka ka lebaka la matla a khoheli ke 10 ms –2 . Fumana lebelo la mango ha e fihla fatše.
Tse tsejoang:
Bophahamo (h) = limithara tse 2 s
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Ho batloa: lebelo la mango ha le fihla fatshe.
Tharollo:
Matla a pele a mechini (M E o ) = matla a khoheli a ka bang teng (P E )
M E = PE = mgh = m (10)(2) = 20 m
Matla a ho qetela a mechini (M E t ) = matla a kinetic (K E )
M E t = K E = ½ mv 2
Molao-motheo oa paballo ea matla a mechini o bolela hore matla a pele a mechini = matla a ho qetela a mechini.
M E o = M E t
20 m = ½ mv 2
20 = ½ v 2
2(20) = v2
40 = v 2
v = √40 = √(4)(10) = 2√10 m/ s
[ID ea sephutheloana sa wpdm='1166′]
- Mosebetsi o etsoang ka mathata a matla le litharollo
- Mathata le litharollo tsa matla a kinetic a mosebetsi
- Mathata le litharollo tsa motheo oa matla a sebetsang le a mechini
- Mathata a matla a khoheli le litharollo
- Matla a ka bang teng a mathata le ditharollo tsa selemo se tenyetsehang
- Mathata a motlakase le litharollo
- Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao oa ho oa ka bolokolohi
- Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao oa holimo le tlase motsamaong oa ho oa ka bolokolohi
- Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao holim'a bokaholimo bo kobehileng
- Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao sefofaneng se sekametseng
- Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao oa liqhomane
