FORCE AND MOTION
The longest chapter in SPM Physics and it will surely be asked in SPM since it will be link to the next chapter, pressure and in form 5. So, you must do well in force and motion. By saying the word longest, most of you would have certainly drop your senses. Do not be afraid, force is the most easy to understand chapter.
Before i start this chapter, please burn these few new terms in your brain as it plays a massive role in your whole physic life.
Distance---Displacement
Displacement is the shortest distance between the initial point and the destination point. Distance is the total path took to travel form the initial point to the destination point. Image above, red line is the displacement and the black line is the distance.
Speed and Velocity
Speed=distance divided by time
Velocity=displacement divided by time.
Acceleration and deceleration.
This is a very important concept that you must understands between acceleration and deceleration.
Acceleration means getting faster and faster.
Deceleration means getting slower and slower. (negative acceleration)
Alright, have you memorized them? If yes, then you can proceed.
Ticker Tape
In this chapter, you will start with ticker tape. Ticker tape is a long strip of paper, with a width of the kind of paper you used to fold stars, at least 2 meters long, and white in colour, of course. In the ticker tape experiment, you will need a ticker timer. Ticker timer is an instrument that has a strip of metal that will vibrate up and down with a frequency of 50Hz, (just for your info, 50Hz because TNB provide 50Hz power supply only. USA is 45Hz, China is 55Hz.) that can produce a chain of dot on the strip of ticker tape.
Basically, you must know how to interprete the ticker tape.
Interval between two consecutive (side by side) dot:
Short=slow movement
Long=fast movement
Overall motion:
same length between all the dots=constant velocity(not speed) or zero acceleration
Short to Long =acceleration
Long to Short =deceleration
All calculations about ticker timer is advisable that you ask someone to show you. It is too difficult to explain in words. But i will still try to explain to you.
After all the hectic arrangement for the cut ticker tape on a piece of graph paper, you will see a shape in the graph.
A stage like graph=constant velocity, zero acceleration.
A step up staircase graph=acceleration
A step down staircase graph=deceleration
2 Golden Equation of Motion
If you wish to continue on physics in tertiary education(A-level, STPM and so-on), you must remember them. If you wish to score an A in physics, you must know how to use them.
s=1/2 ut+1/2 at^2
v^2=u^2+2as
In you text book, you will see 4 equation, actually only two will be useful. With only these two, you can do all the question, is just the matter whether you can apply it or not.
0 Response to "FORCE AND MOTION"
Post a Comment