henpen 2 years ago Friction problem

1. henpen

|dw:1355575152488:dw|

2. henpen

$\mu=\frac{F_F}{R}=\frac{4+5\sin(60)}{12-5\cos(60)}=0.877$

3. henpen

|dw:1355575247470:dw| What is the acceleration of each of the blocks now?

4. henpen

|dw:1355575315635:dw|

5. henpen

$F_2=R\mu=9.5*0.877=8.33$So no acceleration of the bottom thing. Is this correct?

6. henpen

|dw:1355575432583:dw|

7. henpen

Because $0.65+4 <8.33$

8. henpen

Is this correct?