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The truck, in passing, creates a vortex of air... first repelling your car, then a vacuum, pulling your car in to literally 'fill' the void! In motor racing, drivers use the change in frictional air forces, to catapult themselves past opponents...ie/ overtake!! The downside is that they can get caught in what is known as 'dirty air', creating, depending on wind direction, speed and their position in relation to the car in front, a 'drag'... that holds their car in a bubble of air making it very difficult to gain any momentum on the car that they are chasing! This does work both ways tho', as when being 'lapped', the rear cars can hamper the leading car, allowing the second position car a 'free passing' opportunity..

As the truck speeds past you, a vortex is created around it and behind it. The pressure in this region is actually a little bit less than atmospheric pressure. So your car is "sucked" toward the truck. This is the same principle nascar drivers use when they "draft" other cars to save gas. The slight vacuum behind the lead car pulls the drafting car ahead and requires the drafting car to do less work.

The truck creates an area of low pressure in between the two vehicles. It's trying to get back to equilibrium, and unfortunately, that means it pulls anything around it toward the area of low pressure.

btw....it's NOT gravity. Gravity is a tiny force, unless it is involving objects MUCH more massive than a car or a truck

I'm not in Physics but it sounds like it could be the speed of the truck moves the air and creates a vaccum that pulls on your car...not promising that's right though.

The velocity of the air surrounding the truck is increased by its speed.

This causes a slight pressure drop in the air between you and the truck and, you're 'Drawn' towards the lower pressure.

(It's called the 'Bernoulli Effect'..Velocity Increase, Pressure Decrease).

I agree with the low pressure pocket.

Yes, gravitational pull exists, but the fact that they are moving is irrelevant in gravity case.

Low pressure area will pull the car towards it to attempt to equalize

i think this is bernullies law. the pressure increases so they get pulled towards eachother then go in opposite directions.

Think in terms of bernouli's Principle.

Gravity. Everything has gravity. Since the object is larger it has more gravity and pulls the smaller objects.

Becasue the gravitational pull is pulling you toward it

im not sure tho