![]() Not being bumped around it all, you would not be able Sitting in either this elevator or this elevator, assuming it's Here, once the toddler gets to this stage, Velocity of 0, you have no net force on you. Have some higher force here because I'm moving upwards. Is accelerating upward, the normal force is To need 20 more than that in the positive direction. It, if you have negative 98 newtons here, you're going Is positive 20 newtons, or 20 newtons in the Upwards at 2 meters per second, you have a net force In order for the elevator to accelerate the toddler ![]() Not only keep it stationary, but is also doingĪnother 20 newtons in the upwards direction. Right over there, 98 newtons downwards- we need aįorce that not only bounces off that 98 newtons downwards to That's the same thing here that's that one The force due to gravity at 98 newtons downwards. Per second squared, which is the same thing as Per second squared, which is equal to 20 kilogram meters ![]() Times the acceleration of this toddler, times 2 meters The net force is going toīe the mass of this toddler. What the net force must be on this person, or on On this individual right over here? Well, this individual So that force wouldīe an equal force but in the opposite direction. In this situation is the force of the floor Gravity and this poor toddler would be plummeting to Was nothing else, there would be a net force of Net force on them, there must be some force that'sĬounteracting this force. If they have no accelerationĭirection right here, that means that there mustīe no net force on them. Situation right here, this person has no acceleration. ![]() So it's going to have the sameįorce of gravity downwards in every one of Mass, this toddler's mass, does not change, depending We know it slightly changes with the distanceįrom the center of the Earth. Gravitational field is roughly constant, although Well, what's going to be theĭownward force of gravity here? Well, it's going to The force of gravity, is going to be 10 times negativeĩ.8 meters per second squared. The surface of the Earth is 9.8 meters per Over here, its mass times the gravitationalįield near the surface of the Earth, the 9.8 Think about it, what is this person's weight? Well, in this vignette Although I that's notĪ rigorous definition. My son, although I think he's 12 kilograms. Gravitational attraction to the Earth and the The surface of the Earth, I have some type of These situations, if we're operating near That we are operating near the surface of the Earth. Is negative 2 meters per second squared times-Īccelerating downwards now. So at least at theĬonstant velocity, we travel for 20 meters. And then let's say weĭo that for 10 seconds. To be 2 meters per second in the j direction, or In the j direction, only you don't have to write Little screen over here, our acceleration Second times the j unit vector because that tells us Right over here, let's say that the acceleration Per second squared in this picture right over here. You- but its acceleration is also 0 meters Now also it isĪlso- and this may be somewhat obvious to And everything we're going toīe talking about in this video, I'm talking about in Picture right over here, I'm going to assume that Them almost happening in some type of a sequence. Son is obsessed with elevators, I thought I would In scenario 4, the same two opposing arrows, with a third, unbalanced 20N force pointing downward.ĭifferent scenarios. In scenario 3, there are the same two opposing arrows as scenario 1. In scenario 2, there are the same two arrows, but a third unbalanced 20N arrow points up. To summarize, from a diagram of forces perspective, in scenario 1, there are two force arrows at 98N, equally opposed and balanced. In the 4th scenario, the direction of the 20N force is in the opposite direction, yielding a total of 78N upward. In the 2nd scenario, there is a 10kg*2m/s^2=20N upward force added to the normal force of 98N for a total upward force of 118N. Here's where it gets tricky: in the 2nd and 4th scenarios, the gravity force and the normal force are identical to the 1st and 3rd scenarios, except that in the 2nd and 4th scenarios, there is an additional force in the normal direction which must be accounted for. a 98N downward-acting force due to gravity, and a 98N upward-acting force due to the normal force of the elevator floor pushing up on the toddler's feet. In the 1st and 3rd scenarios, the forces on the toddler are identical, i.e. In order to understand the physics of a situation, you must understand how the forces act on the object(s). It's important that you understand the concept of a diagram of forces.
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