Have the force of friction counteracting this pullingįorce, the force of tension, the force of friction. Or sometimes it can even beĭue to molecular interactions where they're kind of sticky, where the objects areĪttracted to each other and you gotta pull passed that. The two objects are rough and you kind of have to And friction, fundamentally, it could be because the surfaces of That's because there's friction between the object and the ground. Trying to pull on something, trying to drag something across the ground and it doesn't move, and What force would that be? Well, that would be the force of friction. That is counteracting that, that is netting against that, So let me do that on my free body diagram. Pulling to the right with a force of magnitude F sub T. But what about the horizontal direction? I already said that I'm The ground is holding up the block is one way to think about it, keeping it from accelerating downwards. And that's going to beĬounteracted by the normal force of the ground on the block. You're going to have the force of gravity or the weight of the block Now, in the vertical direction, you have the same thing that What would be the free bodyĭiagram for this block? Well, I'll do the same thing again. Let's just call this the force of tension. And I have a situation where I am pulling on this block using a rope with a force of magnitude, Let's try to kind of combine these things, and we'll actually introduce a new force. Is denoted by capital T or it might be a F sub T. Here is an upward force that nets out against Well, you got the string that's holding it up, But what's keeping it fromĪccelerating downwards? Well, you might say, The force of gravity acting downwards on the block. Well, once again, I am onlyĬoncerned with the block. But once again, everything is stationary. Let's do another example, but this time, instead of having the block on a table, let's say it is hanging from a string which is attached to the ceiling. And its magnitude you couldĭenote as capital F sub N. The surface of an object, that's known as normal force. And this force of pushing in a direction that is perpendicular to Now, what would that be? Well, that would be the force of the table pushing on the block. So there must be anotherįorce that is netting out against the force of gravity.
But going back to this free body diagram, if this was the onlyįorce acting on the block, the block would accelerate downwards. Orbit, it would still have gravitational interactions with the earth. Even if this block was in orbit, even if it wasn't in Had contact with a table which maybe has contact with the earth, weight, or the force of So you're gonna have a downward force, and it's magnitude is gonna be F sub g. The block is on earth, we're assuming that it's stationary. So, if we're looking at only the block, what's going on? We're going to assume that Remember, in free body diagrams, you only care about theįorces acting on one of the the objects in your system. What are all of the forces that are going to act on this blocK? Well, to do that, to think about that, I can draw a free body diagram where I am only going to draw the block. So let's say I have a table here, and I have a block that is Video, we're gonna discuss different types of forces, but we're gonna do it in the context of free body diagrams. Just a clarification, I am taking my first year of Physics so if I make a mistake or need to add anything please suggest it. Sorry for a long response, but if you have any questions please do reply back. Friction may play a small role, but it did not play a major role relating to the inertia of the object. The external force here is your seat that stops the book to keep flying. For example, you are driving a car and suddenly you see a deer in front of you and you slam your brakes, meanwhile, your book is in the back seat and it flies and hits the back of your seat. While that answers your question I also want to give an example of when friction is not necessarily related to inertia. The book stops because of the frictional force that is affecting the book while it is sliding across the table. An example of friction being related to inertia: A book is sliding across a table and it stops after a certain amount of time. Inertia is defined as an object will be in motion as long as it is affected by an external force(usually friction, but not always). A light rope is attached to it and runs over a pulley.Yes, it is, in fact, it can be due to friction an object has inertia. \): Block on the Table (Coupled Blocks)Ī block rests on the table, as shown.
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