Formulas!!!
Volume of cylinder is
HRsq (R is to the power of 2)
Volume of cone is 1/3
HRsq (R is to the power of 2)
Hint to remember it easily- Cone is always 1/3 volume of cylinder, and cylinder is the circle area time its height. This might help u guys to remember.
Now we go on to the surface area of cone and cylinder
Surface area of cylinder
Step 1: We find the circumference of the cylinder
D
Step 2: After that the height of the cylinder mulitple
D. So it
DH
Hint: This is like a rectangle, u find the circumference which is the side, and mulitple the height to find the surface area.
Surface area of a cone is
RL
L is the slanted length of the cone. Sorry this you guys would have to memorise.
Whoa, this is frustrating, I would like to use (pi) to sub for this annoying symbol
!!
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Now for the Sphere volume
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it is 4/3(pi)r.cub (r is to the power of 3)
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and surface area is 4(pi)r .sq ( ris the power of 2)
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That should be most of the annoying formula you guys have trouble with.
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Volume of pyramid and cube you guys should have no problems with.
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Now Shall we go on to kinematics? Alright lets procede.
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Gradient of speed/time graph is the acceleration of the object.
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Area of speed/time graph is the distance travelled by the object.
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For distance/time graph, it is NOT the case!!
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For distance/time graph the distance is given on the graph. since its distance time graph, u can find speed.
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The gradient and the area of distance/time graph do not represent anything at all. So do not get trick.
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* Also when distance/time graph have a constant gradient, it does not makes it accleration constant. Instead the acceleration is 0 cause there is NO increase in speed since the speed is constant cause distance divide by time is speed.
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Also, if you have any problem in mathematics, post it on the blog, I would try to upload it onto the blog. Feedback is very welcome
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Pardon me if there is alot of grammatical errors.
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Signing off Jiexiang
