Which is always true in a closed system?(1 point)
Responses
Velocity is constant.
Velocity is constant.
Mass is not conserved.
Mass is not conserved.
Momentum is conserved.
Momentum is conserved.
Acceleration is not constant.
To determine which statement is always true in a closed system, we need to understand what a closed system is and how various properties behave in such a system.
A closed system refers to a system where no matter or energy is exchanged with the surrounding environment. In a closed system, the total amount of mass and energy remains constant.
Now let's evaluate each statement to see which one holds true in a closed system:
1. Velocity is constant: In a closed system, velocity can change due to internal forces or interactions. For example, if two objects collide elastically, their velocities will change. Therefore, velocity is not always constant in a closed system.
2. Mass is not conserved: In a closed system, mass is indeed conserved. This principle is known as the law of conservation of mass. No matter can be created or destroyed within a closed system, so the total mass remains the same. Therefore, this statement is not true in a closed system.
3. Momentum is conserved: In a closed system, momentum is always conserved. Momentum is defined as the product of an object's mass and its velocity. When no external forces act on a closed system, the total momentum before an event, such as a collision, is equal to the total momentum after the event. Therefore, momentum is always conserved in a closed system.
4. Acceleration is not constant: In a closed system, acceleration can vary depending on the forces acting on the objects within the system. For example, if a rocket engine is fired in a closed system, the acceleration of the rocket will change. Therefore, acceleration is not always constant in a closed system.
Based on the above explanations, we can conclude that the statement "Momentum is conserved" is always true in a closed system.