Speed, Velocity, Distance and Displacement:
First of all you need to learn the difference between distance and displacement. Distance is the length you cover regardless of your direction. You switch your direction while moving in a car or just running and that will be counted as the total distance you cover.
Displacement is different. You have to be moving straight to say that the length you covered is displacement. Both distance and displacement have the same symbol; meter (m)
Speed is the term used to define the total distance covered in seconds. It’s symbol is meter per second^-1 (ms^-1). To calculate Total Speed you have to divide distance with time; Speed = distance/time
Velocity is the term used to define the total displacement covered in seconds. It has the same symbol as speed and has the same equation; Velocity = displacement/time.
Average speed and Average velocity are common terms in physics laboratory. These two terms are used because no such thing has constant speed or constant velocity so we use the term “Average”. There is no difference of equation except for distance and displacement part.
Terminal velocity is another common term. It is used to define constant velocity of a falling object. When an object falls it builds up air resistance which tries to slow it down. Due to gravity the object continues to fall. But due to the air resistance the object would fall at a constant velocity. This constant velocity will be called terminal velocity.
Velocity Time Graph:
Velocity time graph is a handy way of showing whether an object is moving, accelerating or just stopped.
Acceleration is increase in velocity. It’s symbol is meter per second per second (ms^-2). It’s equation is; initial (existing) velocity subtract by its final velocity and then divide by time (V1 -V2/Seconds)
Acceleration of free fall:
Acceleration of free fall is basically about a falling object. Any object falling whether a piece of paper or a ball or a hammer nothing falls at constant speed which is why we use acceleration to define the objects speed. An object falls to the ground because of gravity. The gravitational field around the Earth pulls the object to the ground. The object falling from an elevated height has 0 initial velocity and the gravitational pull is calculated to be 9.81.
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