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“As the box (in the truck) moves with constant velocity down the road, its acceleration is zero.
Therefore, the net force acting on the box must be
zero.”
Which forces are involved in a truck moving with constant velocity (and therefore no acceleration)?
The gravitational force and the normal force cancel each other out.
But the applied force is greater than the frictional force, hence the truck moving, so how do the overall forces end up balanced resulting in a net zero force?
I’m thinking (wrongly, it seems) that the forces are unbalanced, that there is a net force involved, i.e, the applied force minus the frictional force, which is a non-zero amount.
P.S. There will be two friction forces; the friction between the tyres and the road; and the friction between the air and the truck overall. So the sum will be; applied force minus the two frictional forces, which will still give us a non-zero amount.
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