The system below has friction at both contact points.
a. What's the force vector applied to the 1 kg box by the 5 kg box?
b. What's the force vector applied to the 5 kg box by the 1 kg box?
c. What's the force vector applied to the floor by the 5 kg box?
![1880_force.png](https://secure.tutorsglobe.com/CMSImages/1880_force.png)