Recent content by Herman Trivilino

Could be both!

Yes. But if you have two straight parallel wires carrying current in opposite directions, they will repel. This is probably what the question's authors were getting at. Pedagogically it requires the student to understand that a beam of electrons moving one way is equivalent to a current flowing...

But there is no way to distinguish what you are calling "in reality" from what is observed in other frames because there's no way to distinguish between a state of rest and a state of uniform velocity.

In both scenarios there are two events. Just because the two events are simultaneous in one of the frames doesn't make them the same event. They would also have to occur in the same place for that to be true.

What lies at the heart of this all-to-familiar approach is that the superposition principle applies to forces. In other words each force acts independently of the others, which forms the utility of the concept of the net force. The forces are linear, which means we get the total effect of all...

No, it's wrong. But explaining it repeatedly seems to have no effect. I told you to stop trying to generalize comments you read and instead ask questions about them. But you show no signs of even having read those comments, let alone trying to understand them. The force exerted on an object...

No, they are not combined. Force and acceleration are two distinct things and they are very much kept separate. The terminology is what's confusing you. As I said before, gravity is a phenomenon. We can describe it using many tools. Gravitational force and gravitational acceleration are just...

This lies at the root of your misunderstanding. Gravity is the name we give to the phenomenon. There's gravitational force and gravitational acceleration. Two separate things. When you're in an introductory physics course the students and often the instructor will refer to the quantity ##g##...

I know what you mean. ##g## always has a magnitude of 9.8 m/s2 but objects don't always accelerate at this rate, they have to be in free fall.

Did you watch the movie October Sky? Don't remember for sure but think they witnessed it. Maybe it was fictionalized.

No it doesn't! Gravity tends to move things closer together, because the gravitational force is always attractive. Part of your confusion may be from mixing up the gravitational force with the gravitational acceleration. If the gravitational force is the only force acting on an object near...

That's the only way to do it! After all, the 3 m height of the poles has no effect on the distance from the top.

Start with a free-body diagram of the point where the 25 kg object hangs from the nylon rope.

Can you show us that calculation? Or at least the value of the force?

Mechanical energy is conserved only if the collision is perfectly elastic. There is no change in temperature. Is that the same thing as conservation of momentum?