Thursday 26 April 2018
Ramadan And Studies - IOU Blog
Ramadan and Studies: 10 Tips for Hardworking Students
Dear people,
You might want to read this article from Islamic Online University Blog as Ramadan is just around the corner and so are the O Levels and this might be helpful. 🕘 💪🅪📋📘📏📐🍏🌗
Saturday 10 March 2018
O LEVEL PHYSICS - KINEMATICS
Kinematics is a branch of Mechanics that is concerned with pure motion and is not concerned with the forces involving those motion.
Distance (in terms of kinematics) is length covered by a moving object.
Displacement is the linear distance between two points.
Displacement is the linear distance traveled by an object from the starting point to the endpoint.
Linear distance means distance in a straight line.
The SI units of both Distance and Displacement is in meters(m).
Distance is a scalar quantity.
Displacement is a vector quantity.
Let's look at this concept with an example.
Example 1:
Suppose a car travels from A to B and then from B to C (see diagram). What is the car's total distance and displacement?
Answer: The car's total distance is the length that it moved. That is,
distance = 15 + 7 = 22m
And it's displacement is
displacement = 10m
Because this is the linear distance covered between the starting and the endpoint.
The car now further travels from C to A. What is now the car's total distance and displacement starting from A and traveling back to A?
Answer: Now the total distance will be,
distance = 22 + 20 = 40m
And the total displacement will be
displacement = 0m
Because the starting and endpoints are the same and there is zero meters of linear distance in between them.
Now moving on to speed and velocity.
Speed is rate of change of distance. It is measured in meters per second (m/s). It is a scalar quantity.
speed = distance traveled / time taken
Velocity is the rate of change of displacement. It is also measured in meters per second (m/s). It is a vector quantity.
velocity = displacement / time taken
You would find plenty of examples on speed/velocity calculations on your book. Therefore I am not adding another one here. Next we are going to look at Acceleration.
In the simplest of terms...
Acceleration is the rate of change of velocity. It is measured in meters per second square (m/s^2).
It is vector quantity.
acceleration = change in velocity / time taken
But the question still remains of what acceleration actually is or what is happens during acceleration.
So if we now look at a deeper definition...
Whenever there is a change in velocity, there is an acceleration. If the velocity is not changing then there is zero or no acceleration. But another thing to note is that velocity is a vector quantity so if the direction of an object changes, then it's velocity changes. Hence it's acceleration changes.
So, either change in magnitude or change in direction, both results in an acceleration. (This is an important point to note as this often comes as a conceptual question in CIE O Level Exams).
There are two types of acceleration:
Uniform acceleration
Uniform acceleration is when the rate of change of velocity remains constant.
Another name for uniform acceleration is constant acceleration. Constant acceleration means that the acceleration does not change but remains constant. It does not increase or decrease with time.
Distance (in terms of kinematics) is length covered by a moving object.
Displacement is the linear distance between two points.
Displacement is the linear distance traveled by an object from the starting point to the endpoint.
Linear distance means distance in a straight line.
The SI units of both Distance and Displacement is in meters(m).
Distance is a scalar quantity.
Displacement is a vector quantity.
Let's look at this concept with an example.
Example 1:
Answer: The car's total distance is the length that it moved. That is,
distance = 15 + 7 = 22m
And it's displacement is
displacement = 10m
Because this is the linear distance covered between the starting and the endpoint.
The car now further travels from C to A. What is now the car's total distance and displacement starting from A and traveling back to A?
Answer: Now the total distance will be,
distance = 22 + 20 = 40m
And the total displacement will be
displacement = 0m
Because the starting and endpoints are the same and there is zero meters of linear distance in between them.
Now moving on to speed and velocity.
Speed is rate of change of distance. It is measured in meters per second (m/s). It is a scalar quantity.
speed = distance traveled / time taken
Velocity is the rate of change of displacement. It is also measured in meters per second (m/s). It is a vector quantity.
velocity = displacement / time taken
You would find plenty of examples on speed/velocity calculations on your book. Therefore I am not adding another one here. Next we are going to look at Acceleration.
In the simplest of terms...
Acceleration is the rate of change of velocity. It is measured in meters per second square (m/s^2).
It is vector quantity.
acceleration = change in velocity / time taken
But the question still remains of what acceleration actually is or what is happens during acceleration.
So if we now look at a deeper definition...
Whenever there is a change in velocity, there is an acceleration. If the velocity is not changing then there is zero or no acceleration. But another thing to note is that velocity is a vector quantity so if the direction of an object changes, then it's velocity changes. Hence it's acceleration changes.
So, either change in magnitude or change in direction, both results in an acceleration. (This is an important point to note as this often comes as a conceptual question in CIE O Level Exams).
There are two types of acceleration:
- uniform acceleration
- non-uniform acceleration
Uniform acceleration
Uniform acceleration is when the rate of change of velocity remains constant.
Another name for uniform acceleration is constant acceleration. Constant acceleration means that the acceleration does not change but remains constant. It does not increase or decrease with time.
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