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ASIGNATURA:
DÍNAMICAD
DOCENTE:
MG. LYNDON SOTO COZ.UNI
INTEGRANTES:
GUILLERMO VALLE BRAYAM, VARA VENTURA LILIAN, SALVADOR CECILIO PERCY, PABLO LUGO CRISTHIAN
2021
• El movimiento de una placa cuadrada con lados de 150 mm y masa de 2.5 kg, está
guiado mediante pasadores en las esquinas A y B que se deslizan por ranuras
cortadas en una pared vertical. Inmediatamente después de que la placa se libera
desde el reposo en la posición mostrada, determine
• a) la aceleración angular de la placa,
• b) la reacción en la esquina A.
EJERCICIO 2
• Datos: Longitud del lado del cuadrado 150mm y masa 2.5 kg
• Pide a) α b) A
• Por cinemática:
• AG= 2
𝐿
2
aG/A=(AG) α=
𝐿α
2
SOLUCIÓN
MOVIMIENTO PLANO=TRANSLACIÓN+ROTACIÓN
• aB(↓) =aA(←) +aB/A( )
• aB(↓) =aA(←) +L α ( )
• 𝑎 = aA(←)+aG/A ( )
• 𝑎=L αsen30(←)+
𝐿α
2
( )=0.5L α(←)+0.707L α( )
60
ECUACIONES
60
aA=L αsen30
aB=L αcos30
aB/A=L α
15
15 15
• LEY DE COSENOS
• 𝑎2
= aA
2
+ aG/A
2
− 2*aA* aG/Acos15
• 𝑎=0.25882*L α
• LEY DE SENOS
•
𝑎
𝑠𝑒𝑛 15
=
aG/A
𝑠𝑒𝑛𝑏
b=135°
• 𝑎=0.25882*L α( )
ECUACIONES
aA=L αsen30
aG/A =0.707L α
𝑎
b
15
45
• ῳ=0
• encontramos la ubicación del punto E,
donde las líneas de acción de a y b se
interseccionan
• (EG)y=0.6829L -0.5L
POR CINÉTICA
G
E
45
0.183
L
0.183
L
EG=0.258
8L
• 𝐼 =
1
6
𝑚𝑙2
• + 𝑀𝐴 = (𝑀𝐴)𝑒𝐴
∶ 𝑚𝑔 0.183𝑙 = 𝐼𝛼 + 𝑚𝑎 0.2588𝑙
• 0.183𝑚𝑔𝑙 =
1
6
𝑚𝑙2𝛼 + 𝑚(0.2588𝑙𝛼)(0.2588𝑙)
• 0.183𝑔𝑙 = 𝑙2
𝛼(
1
6
+ 0.06698)
• 0.183
𝑔
𝑙
= 0.2336𝛼 ; 𝛼 = 0.2834 𝑔/𝑙
• 𝛼 = 0.2834
9.81𝑚/𝑠2
0.15
; 𝛼 = 51.2𝑟𝑎𝑑/𝑠2
ECUACIONES
• +↑ 𝐹𝑦 = (𝐹𝑦)𝑒𝐴 ∶ 𝐴 − 𝑚𝑔 = −𝑚𝑎𝑠𝑒𝑛45
• = −𝑚 0.2588𝑙𝛼 𝑠𝑒𝑛45°
• = −𝑚 0.2588𝑙 0.2834
𝑔
𝑙
𝑠𝑒𝑛45°
• 𝐴 − 𝑚𝑔 = 0.1434𝑚𝑔
• 𝐴 = 0.566𝑚𝑔 = 0.85566 2.5 9.81
𝑚
𝑠2 = 21.01N
• 𝐴 = 21.01𝑁 ↑
ECUACIONES
• Retome el problema , y ahora suponga que la placa se conecta con un solo pasador en
la esquina A.
• Datos: Longitud del lado del cuadrado 150mm y masa 2.5 kg
• Pide a) α b) A
CONTINUACIÓN
• Ya que ambos A y mg están en la vertical.
• 𝑎x=0 y la 𝑎y es diferente de cero
• Por cinemática
ECUACIONES
• AG=
𝐿
2
aG/A=(AG) α( )
• 𝑎 = aA(←)+aG/A ( )
• 𝑎=0.183L α
ECUACIONES
15
15
aA
𝑎=
𝐿α
2
sen15
aG/A=
𝐿α
2
15
• + 𝑀𝐴 = (𝑀𝐴)𝑒𝐴
∶ 𝑚𝑔 𝐴𝐺 ∗ 𝑠𝑒𝑛15 = 𝐼𝛼 + 𝑚𝑎 𝐴𝐺 ∗ 𝑠𝑒𝑛15
• 𝐼 =
1
6
𝑚𝑙2
• 𝛼=59.8 rad/s2
• +↑ 𝐹𝑦 = (𝐹𝑦)𝑒𝐴
∶ 𝐴 − 𝑚𝑔 = −𝑚𝑎
• 𝐴 − 𝑚𝑔 = −𝑚(0.183𝐿𝛼)
• A=0.8326mg
• A=20.4N
POR CINÉTICA

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Movimiento plano de cuerpos

  • 1. ASIGNATURA: DÍNAMICAD DOCENTE: MG. LYNDON SOTO COZ.UNI INTEGRANTES: GUILLERMO VALLE BRAYAM, VARA VENTURA LILIAN, SALVADOR CECILIO PERCY, PABLO LUGO CRISTHIAN 2021
  • 2.
  • 3. • El movimiento de una placa cuadrada con lados de 150 mm y masa de 2.5 kg, está guiado mediante pasadores en las esquinas A y B que se deslizan por ranuras cortadas en una pared vertical. Inmediatamente después de que la placa se libera desde el reposo en la posición mostrada, determine • a) la aceleración angular de la placa, • b) la reacción en la esquina A. EJERCICIO 2
  • 4. • Datos: Longitud del lado del cuadrado 150mm y masa 2.5 kg • Pide a) α b) A • Por cinemática: • AG= 2 𝐿 2 aG/A=(AG) α= 𝐿α 2 SOLUCIÓN MOVIMIENTO PLANO=TRANSLACIÓN+ROTACIÓN
  • 5. • aB(↓) =aA(←) +aB/A( ) • aB(↓) =aA(←) +L α ( ) • 𝑎 = aA(←)+aG/A ( ) • 𝑎=L αsen30(←)+ 𝐿α 2 ( )=0.5L α(←)+0.707L α( ) 60 ECUACIONES 60 aA=L αsen30 aB=L αcos30 aB/A=L α 15 15 15
  • 6. • LEY DE COSENOS • 𝑎2 = aA 2 + aG/A 2 − 2*aA* aG/Acos15 • 𝑎=0.25882*L α • LEY DE SENOS • 𝑎 𝑠𝑒𝑛 15 = aG/A 𝑠𝑒𝑛𝑏 b=135° • 𝑎=0.25882*L α( ) ECUACIONES aA=L αsen30 aG/A =0.707L α 𝑎 b 15 45
  • 7. • ῳ=0 • encontramos la ubicación del punto E, donde las líneas de acción de a y b se interseccionan • (EG)y=0.6829L -0.5L POR CINÉTICA G E 45 0.183 L 0.183 L EG=0.258 8L
  • 8. • 𝐼 = 1 6 𝑚𝑙2 • + 𝑀𝐴 = (𝑀𝐴)𝑒𝐴 ∶ 𝑚𝑔 0.183𝑙 = 𝐼𝛼 + 𝑚𝑎 0.2588𝑙 • 0.183𝑚𝑔𝑙 = 1 6 𝑚𝑙2𝛼 + 𝑚(0.2588𝑙𝛼)(0.2588𝑙) • 0.183𝑔𝑙 = 𝑙2 𝛼( 1 6 + 0.06698) • 0.183 𝑔 𝑙 = 0.2336𝛼 ; 𝛼 = 0.2834 𝑔/𝑙 • 𝛼 = 0.2834 9.81𝑚/𝑠2 0.15 ; 𝛼 = 51.2𝑟𝑎𝑑/𝑠2 ECUACIONES
  • 9. • +↑ 𝐹𝑦 = (𝐹𝑦)𝑒𝐴 ∶ 𝐴 − 𝑚𝑔 = −𝑚𝑎𝑠𝑒𝑛45 • = −𝑚 0.2588𝑙𝛼 𝑠𝑒𝑛45° • = −𝑚 0.2588𝑙 0.2834 𝑔 𝑙 𝑠𝑒𝑛45° • 𝐴 − 𝑚𝑔 = 0.1434𝑚𝑔 • 𝐴 = 0.566𝑚𝑔 = 0.85566 2.5 9.81 𝑚 𝑠2 = 21.01N • 𝐴 = 21.01𝑁 ↑ ECUACIONES
  • 10. • Retome el problema , y ahora suponga que la placa se conecta con un solo pasador en la esquina A. • Datos: Longitud del lado del cuadrado 150mm y masa 2.5 kg • Pide a) α b) A CONTINUACIÓN
  • 11. • Ya que ambos A y mg están en la vertical. • 𝑎x=0 y la 𝑎y es diferente de cero • Por cinemática ECUACIONES
  • 12. • AG= 𝐿 2 aG/A=(AG) α( ) • 𝑎 = aA(←)+aG/A ( ) • 𝑎=0.183L α ECUACIONES 15 15 aA 𝑎= 𝐿α 2 sen15 aG/A= 𝐿α 2 15
  • 13. • + 𝑀𝐴 = (𝑀𝐴)𝑒𝐴 ∶ 𝑚𝑔 𝐴𝐺 ∗ 𝑠𝑒𝑛15 = 𝐼𝛼 + 𝑚𝑎 𝐴𝐺 ∗ 𝑠𝑒𝑛15 • 𝐼 = 1 6 𝑚𝑙2 • 𝛼=59.8 rad/s2 • +↑ 𝐹𝑦 = (𝐹𝑦)𝑒𝐴 ∶ 𝐴 − 𝑚𝑔 = −𝑚𝑎 • 𝐴 − 𝑚𝑔 = −𝑚(0.183𝐿𝛼) • A=0.8326mg • A=20.4N POR CINÉTICA