A lot of people have trouble understanding kinematics, but it is important to understand to succeed. It helps us understand how objects move and interact with the world around them. In this blog post, we will outline tips that can help you better understand this topic so you can achieve your goals!
Know the difference between velocity and acceleration
Velocity is how fast your object moves, while acceleration is the rate at which velocity changes. This may sound like it's saying the same thing, but they are actually very different concepts! Imagine if you were driving a car and stopped quickly, this would be changing your velocity (from moving to not-moving).
However, this change in speed wouldn't be considered an acceleration since you didn't start with zero speed. That said, there can still be both an acceleration and a deceleration when dealing with objects that have high speeds or large masses.
Understand the relationship between displacement, distance, time, and speed
Displacement is how far an object moved, while the distance is simply a representation of the length between two points. Understanding kinematic equations give you great strength in the field of physics. Time and speed are also related since they change hand-in-hand as displacement changes (speed = d/t).
This is very important when dealing with kinematics because if you know two of these pieces of information, then you can find the other. For example, say that an object travels 200m in one minute (d = 200 and t = 60). The speed would be calculated as:
20kmph ⇒ 20x(200/60) ≈ 16 kmph
Be able to calculate average velocity using a simple formula
It is often useful to know the average velocity of an object over a while. This formula can be used by taking the total distance traveled and dividing it with the total elapsed time:
Average Velocity = Δd/Δt
For example, if you ran 100m in 45 seconds (Δt = 15s), then your average velocity would be calculated as follows:
average velocity= ∆d/∆t
100(15) / 60 ≈ 25 m per minute.
Understand how energy is conserved in a collision or impact
If you collide with a moving object, your kinetic energy will decrease. This is because when an object collides inelastically, the total amount of KE before and after the collision must be equal to zero (energy can't be created or destroyed).
At first, it might seem like this would happen naturally since objects are likely to stop moving when they meet each other head-on. However, if two boxes collide from opposite directions then there's still going to be some KE involved. In physics problems involving collisions between objects that have mass, we often assume that no matter how large or small one box may be compared to another – both sides experience the same force during impact. So even though smaller things do not need as much energy put into them to start moving, they also don't have as much energy to lose either.
Know how to calculate the kinetic energy of an object before and after collisions or impacts
This one is so important! If you know the mass and speed of an object, then it's easy to calculate its kinetic energy (KE = ½ mv²). However, what happens if we want to find out how much KE is involved in a collision? This requires us to use conservation of momentum!
6. Understand what it means when you hear something has potential energy (e.g., the ball had potential energy)
When we say that something has potential energy, this means it is capable of doing work. This can be represented as:
PE = Work Done / Change in Kinetic Energy
For example, if you lift a box to the top of a two-story building (W = 50J) and then drop it, what would happen? Well at first there's no KE since both objects are at rest relative to each other. Once they collide with one another, all their combined PE will turn into kinetic energy!
The total amount of KE after impact may not equal 100% due to things like friction or air resistance acting on the boxes during fall – but by conservation laws, we know that any loss must have been from somewhere else beforehand (i.e., the PE was lost as heat/sound).
This is why it's important to understand potential energy because not all forms of work are reversible.
This means that you can't just use this equation and solve for KE, or vice versa. Conservation laws only allow us to find missing information if we know what else has been done (and how much).
Now that you've learned the basics of kinematics, we hope it's easier to understand and apply these concepts in your daily life. Those equations are used in all kinds of fields with a variety of applications, but they work best when you know how to use them correctly! Anyone involved in collisions or impacts must understand how energy is conserved and what it means when something has potential energy before a collision or impact occurs. Good luck with all future endeavors in physics research, problem-solving, and engineering design!