- #1
jakeddong
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Hi, so I am currently learning about force in my physics class in high school. I get the calculation part but I'm really confused about the whole concept.
For example: when a nickel slides on a flat surface of glass and hits a penny, the nickel stops and the penny shoots off. The nickel receives the same force it hit the penny with(normal force) and therefore cancels out its motion, proving Newton's Third Law of motion.
But when a sliding nickel hits a nonmovable object such as a wall, it bounces off. Why is it that normal force of nickel does not cancel out its motion in this case? To say more specifically, why did nickel transfer all of its kinetic energy to the penny, but not to the wall?
Another problem.
I learned that force is something that accumulates, meaning that if an object requires 100N of instantaneous force to push it across the ground at a constant speed, then when you apply a constant force 20N/s for 5 seconds, the object moves. Right? So if force accumulates over time, then does that mean everything is technically "breaking"
For example: if a chair is placed in a room of vacuum where the only force exerting on it is the normal force from the gravity. Then, would it break eventually in billions of years because of that constant normal force acting on it?
These are not homework problems, I came up with these scenarios and could not answer why they happen the way they do. So if you could please help answer these I'd really appreciate it. Thank you!
For example: when a nickel slides on a flat surface of glass and hits a penny, the nickel stops and the penny shoots off. The nickel receives the same force it hit the penny with(normal force) and therefore cancels out its motion, proving Newton's Third Law of motion.
But when a sliding nickel hits a nonmovable object such as a wall, it bounces off. Why is it that normal force of nickel does not cancel out its motion in this case? To say more specifically, why did nickel transfer all of its kinetic energy to the penny, but not to the wall?
Another problem.
I learned that force is something that accumulates, meaning that if an object requires 100N of instantaneous force to push it across the ground at a constant speed, then when you apply a constant force 20N/s for 5 seconds, the object moves. Right? So if force accumulates over time, then does that mean everything is technically "breaking"
For example: if a chair is placed in a room of vacuum where the only force exerting on it is the normal force from the gravity. Then, would it break eventually in billions of years because of that constant normal force acting on it?
These are not homework problems, I came up with these scenarios and could not answer why they happen the way they do. So if you could please help answer these I'd really appreciate it. Thank you!
