With respect to the nature of movement, motion is mainly categorized into four different types: Even though this universe is in continuous motion, but, there are different types of motion which will make your understanding more detailed and clear. For example-a moving train, a rotating fan, a ball rolling around etc. It can be defined as a process of changing position. Motion is the free movement of a body with respect to time. With respect to the nature of the movement, motion is classified into three types as follows: Let's understand more about classification. In this topic, we have discussed the linear motion definition. Depending on the path taken by the particle the motion can be classified as projectile motion, rectilinear motion, rotational motion, and many more. Some objects move in a curved path while some in a straight path and a few others in a zig-zag way. As we can notice that different objects move in different ways. There is a change in the position of the object involved in these activities.įish swimming in the water, dropping of stone from a certain height, the flow of air which is coming in and out of our lungs, the automobiles carrying passengers from one place of pick up to the destination is also an example of motion. Our daily activities including walking, running, etc. It requires both the magnitude and direction for complete representation. While displacement can be defined as the shortest distance between the initial and final position. It can be represented by a magnitude only. The distance can be defined as the total path covered during the motion. So, with respect to the change in the position, we have two quantities that can be used to describe any change in the position and they are distance and displacement. Whenever we speak about motion or rest it is always explained with reference to some fixed point which is known as the origin. We all live on this earth that is continuously moving, so now, are you in the state of motion or at rest? Well, finding answers to this complex question can be slightly confusing but let us break down the concepts and simply learn about motion and its types. But let us try to re-evaluate the situation. If you don't use slug & pounds you need to modify F = m * a to be something like F = k * m * a where k is a unitless scaling constant equal to 1/32 to adjust the result so that 1 pound mass under standard gravity produces 1 pound-force.Let us assume that you are reading a book sitting on your sofa, now, think whether you are in motion or at rest? Clearly, here you are at rest. Because of this there is a unit called a slug that is used for mass where a 1 slug mass will accelerate at 1 ft/s^2 when a 1 pound force is applied and using this a 1 slug mass will produce 32 pound-force under standard gravity. When you are dealing with science you usually have to be more precise about the terms you use because you can be dealing with conditions that are not as simple as you standing on a stationary scale in a doctors office where.įor pounds it is considered a unit of mass and can be used as force, also referred to as the pound-force, but that causes confusion with formula like F = m * a for example if you have a 1 pound (mass) object accelerated by gravity at 32 ft/s^2 you have a force of 32 pounds (force) but a 1 pound mass produces a 1 pound-force force under standard gravity. Since the conversion between mass and weight is fairly constant for every day activities they have been used fairly interchangeably. That's what makes science and math so great is that it explains why things like this, that initially sound counterintuitive, are actually correct. It's because the earth curves that the ships will drop below a point where they can be seen.) (If you are having trouble seeing this just imagine the horizon and how ships can go 'over' it. If you could throw a baseball fast enough, it would circle the earth because the farther the ball goes forward the further down "ground" is since the earth is curved, if you would move in a straight line the ground would eventually recede beneath you. Just because it never reaches ground doesn't mean it isn't falling toward that ground.Įssentially, an object in orbit means that object is constantly falling toward another object (an object in orbit around Earth constantly falls toward Earth), but because it is also moving sideways (and not just straight down, imagine throwing a ball how it moves 2 directions: down and in the direction you threw it) then it never actually hits the ground.
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