Always. No exceptions are known.
In an inelastic collision, the total energy is not conserved because some of the kinetic energy is transformed into other forms of energy, such as heat or sound.
Basically, in physics, total energy is always conserved. Of course, it is possible for some of the energy from a car to go somewhere else.
Yes, kinetic energy is conserved in an elastic collision, meaning the total kinetic energy before the collision is equal to the total kinetic energy after the collision.
Yes, total energy is always conserved in a closed system, according to the law of conservation of energy. Energy can change forms within a system (e.g., potential energy to kinetic energy), but the total amount of energy remains constant.
Momentum is conserved in a collision. If two cars have the same mass and are traveling at the same speed and collide headfirst, the momentum of both cars cancel each other out and they will be motionless. If one has greater speed or mass than the other, it will still have the difference in momentum after the collision.
No. Total energy is always conserved, but not so mechanical energy.
In an inelastic collision, the total energy is not conserved because some of the kinetic energy is transformed into other forms of energy, such as heat or sound.
Energy is conserved in a chemical reaction, meaning the total amount of energy before and after the reaction remains constant. This principle is known as the law of conservation of energy.
Total energy.
Basically, in physics, total energy is always conserved. Of course, it is possible for some of the energy from a car to go somewhere else.
Yes, kinetic energy is conserved in an elastic collision, meaning the total kinetic energy before the collision is equal to the total kinetic energy after the collision.
Energy is always conserved. When friction is present, the energy usually just turns into heat.
Yes, total energy is always conserved in a closed system, according to the law of conservation of energy. Energy can change forms within a system (e.g., potential energy to kinetic energy), but the total amount of energy remains constant.
Conserved. Energy cannot be created or destroyed, it can only change forms.
Momentum is conserved in a collision. If two cars have the same mass and are traveling at the same speed and collide headfirst, the momentum of both cars cancel each other out and they will be motionless. If one has greater speed or mass than the other, it will still have the difference in momentum after the collision.
Kinetic energy is conserved in a system when there are no external forces acting on the system, meaning that the total amount of kinetic energy remains constant.
The sum of potential and kinetic energy is called "mechanical energy". This is NOT conserved, though - unless you consider the microscopic scale, in which case (for example) heat energy is a type of kinetic energy. In this case, the sum is simply the total energy, and the total energy IS conserved.