# Homework H5.O - Fa22

Discussion and hints:

Recall the following four-step plan outline in the lecture book and discussed in lecture:

Step 1: FBDs
Draw individual free body diagrams for the bar and the disk.

Step 2: Kinetics (Newton/Euler)
Write down the Newton/Euler equations for the disk and for the bar based on your FBDs above.

Step 3: Kinematics
You need to use the rigid body acceleration equations to relate the accelerations of O and the center of mass of the bar, G, through the angular acceleration of the bar. Also, you need to relate the acceleration of O to the angular acceleration of the disk.

Step 4: Solve
Solve your equations for the angular accelerations of the bar and the disk.

Any questions?

## 6 thoughts on “Homework H5.O - Fa22”

1. Somya Jain says:

Does the internal force at O act in the direct of the bar or are they independent?

1. Christian Charlson says:

I think it may just be based on the way you draw them in the FBD.

2. Quqi Zhang says:

No because the bar has its own weight, so it is not a two force member

2. skfree says:

Do we not need to know the coefficient of kinetic friction?

3. Aquinas says:

How many equations do we need to solve this problem? Do we need to relate acceleration of O to the contact point with the ground?