That is only possible by an outside force - a force from outside the system. The type of force is not important, but it must come from the outside.
Momentum
law of conservation of momentum
It's the mass of a object on its velocity (the velocity is a vector and as result of multiplication of a scalar (mass) on a vector (velocity) you get a vector (momentum). Intuitively, momentum is the property of a body which enables it to resist a force.
That means that a quantity, called "momentum", can be defined, and that this quantity does not change over time. In any collision, for example, the momentum (which is defined as mass x velocity) of individual objects can change, but the total momentum does not change. Please note that since velocity is a vector quantity, momentum is also a vector quantity.
Well... the law of conservation of momentum states that "In a system consisting of bodies on which no outside forces are acting; the total momentum of the system remains the same."
Total momentum in an isolated system does not change. The law of physics. The law of conservation of momentum explains that momentum is neither lost of gained. That means that there is a quantity, called momentum, that is conserved.
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conservation of momentum
Any external force applied on the system. Type of force ? ; from collision with another system, from a gravity field, gravity force. Depending on the system, from other field forces like electromagnetic force.
The total momentum of the system doesn't change. In this case, it refers to the momentum of the toy truck plus the momentum of the toy car.
If there are no outside forces acting on a system of particles the total momentum of the system will remain constant; i.e. the center of mass of the system will remain at rest or move at constant velocity.