Figure 4.32
(
a
) The force
acts on the truck and propels it forward. The drawbar exerts the tension force
on the truck and the tension force
on the trailer. (
b
) The free-body diagrams for the trailer and the truck, ignoring the vertical forces.
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acts on the truck and propels it forward. The drawbar exerts the tension force 
on the truck and the tension force 
on the trailer. (