A truck is pulling a car. F_T is the magnitude of the force that the truck exert

Question

A truck is pulling a car. F_T is the magnitude of the force that the truck exerts on the car bullet F_C is the magnitude of the force that the car exerts on the truck Consider the following scenarios independently. The truck is driving with a constant velocity, but as it turns out, the driver of the car left the emergency brake on. F_T > F_C F_T 0 F_T = F_C = 0 The truck is speeding up while driving up a mountain, neglecting friction. F_T > F_C F_T 0 F_T = F_C = 0 The truck is driving up a mountain with a constant velocity, neglecting friction. F_T > F_C F_T 0 F_T = F_C > 0 F_T = F_C = 0

Explanation / Answer

Newton's third of motion law says that every real force exists in pairs which are equal and opposite to each other.

Here force of truck on car and force of car on truck are action reaction pairs so both are always equal .Since work has to be done against gravity both are always non zero and equal

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