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It depends on how fast each is going and how much each weighs.

Momentum is calculated by multiplying the mass of an object by its speed.

A tiny bullet moving very fast can have more momentum than a huge truck if the truck is moving very slowly (or not at all).

(bullet mass) X (bullet speed) > (truck mass) X (truck speed)

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Q: Does a tiny bullet have more momentum than a huge truck?

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If the gun is stationary before the shot, then the momentum of the gun and the momentum of the bullet are equal and opposite after the shot.

The elephant

A bullet fired from a gun

That would depend on their velocity (speed with direction), since the formula for momentum is momentum=Mass*Velocity. If they are moving at the same Velocity, the heavier of the two would have greater momentum.

If a car and a truck are traveling at the same speed, the truck would have more momentum because it has a greater mass.

A parked semi truck has no momentum. A moving bicycle does. If both the bike and the truck are moving at the same speed in the same direction, the truck will have more because it has more mass.

moving truck

Yes. At the same velocity, a truck would have more momentum than a car as it has greater mass. Momentum is the product of mass and velocity: ρ=mv

Newton's laws of Motion state that Momentum is a product of Mass times velocity. Momentum = Mass x velocity. Therefore, a loaded truck needs a larger force to move it, and once it's moving, it needs more powerful brakes to stop it. So a fully loaded truck will have more momentum and be harder to stop than an empty truck.

Momentum is mass times velocity. A bullet could theoretically have the same momentum as a moving truck if the bullet's speed is great enough. But practically, no--a bullet going that fast in the atmosphere would break up or burn up instantly. In outer space, it would be possible, but it would be hard to get the bullet up to that speed. Bullets already travel very fast (a fast bullet can go 4,000 feet per second, which is 2,700 miles per hour), but they are very light (a 250 grain bullet = 0.036 pounds). If a truck weighs 10 tons and is going 55 miles per hour, for instance, that 250 grain bullet would have to travel 30 million miles per hour to have the same momentum. Of course, the trivial answer is yes--both can have zero momentum if neither is moving!

The truck it has more weight behind it.

A truck that is more massive with the same velocity as the truck that is less massive will definitely have more momentum. This is illustrated in the equation for momentum:p = mvWhere p is momentum which is measured in Newton seconds, m is mass which is measured in kilograms, and v is velocity, measured in meters per second. If you plug in a larger mass for that same equivalent velocity, it will accordingly have more momentum.Also, if you just think about it, what would be harder to move: something with more mass or something with less mass?