Tenaga keupayaan graviti – masalah dan penyelesaian

1. Badan seberat 1 kg jatuh bebas from rest, from a height of 10 m.

Determine :

(A) Kerja yang dilakukan secara paksa of graviti

(b) The change in tenaga keupayaan graviti

Pecutan kerana graviti (g) = 10 m/s2

Gravitational potential energy – problems and solutions 1Diketahui:

Massa (m) = 1 kg

Tinggi (t) = 10 m

Pecutan akibat graviti (g) = 10 m/s2

Berat (w) = mg = (1 kg)(10 m/s)2) = 10 N

Penyelesaian:

(A) Work done by force of gravity

W = wh = mgh

W = (1)(10)(10) = 100 Joule

(B) The change in gravitational potential energy

The change in gravitational potential energy is equal to the work done by gravity.

ΔEP = 100 Joule

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2. A 10 N object slides down on the smooth inclined plane along 2 meters. Determine work done by weight force!

Gravitational potential energy – problems and solutions 2Diketahui:

weight (w) = 10 N

wx = w dosa θ = (10)(dosa 30o) = (10)(0.5) = 5 N

d = 2 m

Pecutan akibat graviti (g) = 10 m/s2

Dikehendaki: work done by weight force

Penyelesaian:

W = F d = wx d = (5)(2) = 10 Joule

Penyelesaian alternatif:

Dosa 30o = h / d

0.5 = h / 2

h = (0.5)(2)

h = 1 m

Work done by weight force ;

W = F d = w h = (10 N)(1 m) = 10 N m = 10 Joule

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3. A 1,500 gram object at 20 meters above the ground, free fall to the ground. What is the gravitational potential energy of the object. Acceleration due to gravity is 10 m/s2.

Diketahui:

Pecutan akibat graviti (g) = 10 m/s2

Mass (m) = 1500 gram = 1500/1000 kilogram = 1.5 kilogram

Tinggi (t) = 20 meter

Dikehendaki: The gravitational potential energy

Penyelesaian:

PE = m g h = (1.5 kg)(10 m/s2)(20 m) = 300 kg m2/s2 = 300 Joule

4. Based on figure below, if mass of object 1 is 2 kg and mass of object 2 is 4 kg, comparison of potential energy of object 1 and object 2 is …..

Diketahui:

Jisim objek 1 (m1) = 2 kilogramGravitational potential energy – problems and solutions 5

Jisim objek 2 (m2) = 4 kilogram

Height 1 (h1) = 12 meter

Height 2 (h2) = 9 meter

Dikehendaki: Comparison of potential energy of object 1 and object 2

Penyelesaian:

PE = mg/j

m = jisim (unit antarabangsanya ialah kilogram, disingkat kg)

g = acceleration due to gravity (its international unit is meter per second squared, abbreviated m/s2)

h = height (its international unit is meter, abbreviated m)

PE = gravitational potential energy (its international unit is kg m2/s2 or Joule)

The gravitational potential energy of object 1 :

EP1 = m1 gh1= (2)(g)(12) = 24 g

The gravitational potential energy of object 2 :

EP2 = m2 gh2 = (4)(g)(9) = 36 g

Comparison of the potential energy of object 1 and object 2 :

PE1 : PE2

24 g : 36 g

24: 36

24/12 : 36/12

2: 3

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  3. Masalah dan penyelesaian prinsip kerja-tenaga mekanikal
  4. Masalah dan penyelesaian tenaga keupayaan graviti
  5. Tenaga keupayaan bagi masalah dan penyelesaian spring elastik
  6. Masalah dan penyelesaian kuasa
  7. Aplikasi pemuliharaan tenaga mekanikal untuk gerakan jatuh bebas
  8. Aplikasi pemuliharaan tenaga mekanikal untuk gerakan naik dan turun dalam gerakan jatuh bebas
  9. Aplikasi pemuliharaan tenaga mekanikal untuk gerakan pada permukaan melengkung
  10. Aplikasi pemuliharaan tenaga mekanikal untuk gerakan pada satah condong
  11. Aplikasi pemuliharaan tenaga mekanikal untuk gerakan projektil

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