Explain conservation of momentum by example or by equation
Answers
Explanation:
The Principle of the Conservation of Momentum states that: if objects collide, the total momentum before the collision is the same as the total momentum after the collision (provided that no external forces - for example, friction - act on the system).
Answer:
Explanation:The law of conservation of momentum tells us that the amount of momentum for a system doesn't change. In this lesson, we'll explore how that can be true even when the momenta of the individual components does change.
Momentum Requires External Forces
Even objects at rest are technically 'moving,' but you don't see it because the movement is on a microscopic scale. For example, your computer is a solid piece of equipment, and it may be just sitting there on your table, but all of the molecules that make up the materials of your computer are vibrating around inside. The same is true for your shoes, your coffee cup, a tennis ball, and any other solid object.
The reason these vibrations, or forces, don't cause the object to move is because they are internal forces, and an external force is needed to get an object moving. When you pick up your computer, you cause it to move, just like a tennis racket moves the tennis ball when the two collide.
We look to Newton's third law of motion to explain why this is true. This law states that whenever an object exerts a force on another object, the second object exerts an equal and opposite force on the first. In other words, the forces cancel each other out.
It would be like you sitting inside your car and trying to get it moving by pushing on the dashboard. You're inside the car, so you and the car are part of the same system. You have to push from the outside of the car to get it to move, just like the tennis racket has to hit the ball from the outside to send it flying.
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