Question 13: Consider the third and fourth carriages in a train going uphill. The force that the third carriage acts on the fourth carriage is called force 3, the force that the fourth carriage acts on the third carriage is called force 4. Choose the correct sentence?
Force 3 is the force that the third carriage exerts on the fourth carriage; force 4 The force that the fourth carriage acts on the third carriage, so both forces acting on each other are pulling forces.
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