When an object comes down under gravity in the air, it is subjected at least two forces, the weight  W  and the drag / air resistance  R. The resultant force, F = W  R F = ma W  R = ma, where m and a are the mass of the object and the drag respectively. As the object comes down, the drag, goes …
Thursday 24 February 2022
Wednesday 23 February 2022
Stellar Parallax for A Level Physics  astrophysics
Parallax is an optical phenomenon when the apparent position of an an object changes with the position of the observer. In order to experience this, you can hold the your index finger some distance from your right eye  or left eye, depending on your convenience  and then moving your head slowly to…
Monday 21 February 2022
Basic Calculus  differentiation for beginners IGCSE, AS, ALevel
The process of finding the gradient or slope of a function is the differentiation. We used to find the gradient of a straight line, just by dividing the change in 'y' by change in 'x', in a certain range of values. When it comes to a curve, however, it is not easy to find the gradien…
Saturday 19 February 2022
Galilean Telescope
The Galilean Telescope was invented by the legendary Italian physicist, Galileo Galilei in 1609. It is a simple telescope consisting of a convex lens and a concave lens; they act as the objective and eyepiece respectively. With the aid of his invention, Galileo managed to look at J upiter’s four large…
Friday 18 February 2022
Galileo Galilei in a Jigsaw Puzzle  interactive play
The above jigsaw puzzle is of a famous physicist who was born in the month of February. He was instrumental in turning the astronomy upside down with his discoveries and theories despite being at odds with a powerful religious establishment at that time. You can find out who he is by playing with th…
Monday 14 February 2022
Transformation of Graphs  stretching
The tranformations of graphs are aimed at: GCSE IGCSE GCE OL GCE  AL AS A Level High School T he above animation shows the strtching of a graph parallel to yaxis and xaxis. f(x) → af(x) is stretching parallel to yaxis by a factor a. E.g. f(x) = x²  2x → 2f(x) = 2(x²  2x) f(x) → f(ax) is stretching parall…
Sunday 13 February 2022
RootMeanSquare Voltage  rms voltage of AC
The rootmeansquare value of a function, f(t), is calculated as follows: Integrate the square of the function in the given range of the variable  from a to b in this case. Find the mean value of the above integral, dividing by the range of the variable  (b  a) in this case. Find the square root of…
Thursday 10 February 2022
Transformation of Graphs  reflection
The above animation shows the reflection of graphs. It is as follows: f(x) → f(x) is a reflection in the yaxis f(x) → f(x) is a reflection in the xaxis E.g. f(x) = x 2  2x f(x) = (x) 2  2(x) = x 2 + 2x f(x) = (x 2  2x) =  x 2 + 2x
Tuesday 8 February 2022
Cassegrain Reflector
Cassegrain reflector consists of a concave mirror, convex mirror and an eyepiece. Parallel light from celestial objects enters
the telescope. The large concave mirror, the primary reflector, is used
to collect the light and bring it to a focus. A secondary reflector, the convex reflector, is used to…
Saturday 5 February 2022
Transformation of Graphs  translation
f(x) → f(x + a)  a translation in the negative xaxis by a f(x) → f(x  a)  a translation in the positive xaxis by a f(x) → f(x) + a  a translation in the positive yaxis by a f(x) → f(x)  a  a translation in the negative yaxis by a E.g.1 Sketch y = x 2 + 2x  3 and find the following: The line o…
Friday 4 February 2022
Phase Difference between Two Points on a Wave and Path Difference Explained  interactive
In the above animation, five points on the wave are considered for the explanation. The fully interactive applet is given below for you to practise. The phase of a point implies its direction of vibration on a wave. For example, both points A and E vibrate exactly the same way are said to be in phas…
Wednesday 2 February 2022
Terrestrial Telescope  refracting telescope explained with interactive animation
The above animation is a terrestrial telescope, a refracting telescope. It has evolved from another refracting telescope, the astronomical telescope that produces an inverted image, making it not suitable for viewing objects on the Earth. The terrestrial telescope has addressed the issue to some ext…
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 Terminal Velocity  A Level Physics
 Stellar Parallax for A Level Physics  astrophysics
 Basic Calculus  differentiation for beginners IGC...
 Galilean Telescope
 Galileo Galilei in a Jigsaw Puzzle  interactive play
 Transformation of Graphs  stretching
 RootMeanSquare Voltage  rms voltage of AC
 Transformation of Graphs  reflection
 Cassegrain Reflector
 Transformation of Graphs  translation
 Phase Difference between Two Points on a Wave and ...
 Terrestrial Telescope  refracting telescope expla...

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