The reason the efficiency is always less than 100% is because there is always some sort of friction in the machine.
Answer: because of friction
Bc the clouds are passing over it which creates an illusion of it not moving the same thing happens with the moon while ur in the car
Explanation:
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The momentum change of the system during the collision is always equals to one another.
<h3>Momentum change during collision</h3>
In a collision, the momentum change of first object is equal to and opposite of the momentum change of second object with which the first one collided. Or in other words, the momentum lost by first object is equal to the momentum gained by second object.
The total momentum of the system means the collection of two objects is conserved so we can conclude that the momentum change of the system during the collision is always equals and opposite to one another.
Learn more about collisions here: brainly.com/question/7538238
