1.1. State the equation for the moment of a force.

1.2. Figure 1 shows a rod rotating anti-clockwise around an axle.

Figure 1  

Sketch an arrow to show the force that will cause the biggest rotation. 

1.3. Figure 2 now shows the rod with the axle in the middle instead.

Figure 2

Draw an arrow on the rod that represents the force needed to keep the rod in equilibrium.

1.4. The length of the rod in Figure 1 is 12 cm. The maximum moment for a force F that can be produced is 3.6 N m. 

Calculate F.