BENGKEL TEKNIK FIZIK 2015 SMK PUTERI TITIWANGSA file1 BENGKEL TEKNIK FIZIK 2015 SMK PUTERI...
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1 BENGKEL TEKNIK FIZIK 2015 SMK PUTERI TITIWANGSA Penceramah : Thong Kum Soon Success is depend on your mind and your will. You are the one, who decide it. PROVE IT!!
BENGKEL TEKNIK FIZIK 2015 SMK PUTERI TITIWANGSA file1 BENGKEL TEKNIK FIZIK 2015 SMK PUTERI TITIWANGSA Penceramah : Thong Kum Soon Paper3 Planning experiment 1. Success is depend on
- surface of metal block is hard - time impact is shorter -impulsive force is bigger to change shape of plasticine ball
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drop on soft surface
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[10 marks]
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1.big mass of pile driver - produce bigger force during impact 2. height of pile driver is high- produce high velocity when strike the pile 3. steel pile- stronger/ stiffer 4. base of pile is sharp- produce high pressure/ easy to push pile into the ground of smaller area with high pressure 5.arrangement of piling system of Q is chosen- piling system Q has big mass pile driver, height pile driver is high, steel pile and base pile is sharp
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W= mg= 50x10 = 500.00 N
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v2 = u2 + 2gs = 0 + (2 x 10x 20) = 400 v = 20.00 ms-1
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F= mv-mu / t = 50 (0-20)/ 0.5 = 2000.00 N
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2.
3.
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P= 1.20 x 10 5 - 1.18 x 10 5 = 2.00 x 10 3 Pa
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F= 2 x 10 3 x 2.5 = 5 x 10 3 N
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increase surface area/ increase velocity
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4. Diagram 2.4 shows the speed limit and the load limit of heavy vehicles such as buses and lorries.
Rajah 2.4 menunjukkan had laju dan had muatan bagi kenderaan berat seperti bas dan lori.
Diagram 2.4
(i) Using concept of momentum and inertia, explain why the speed limit and load limit must be
imposed on heavy vehicles. [ 5 marks ]
Dengan menggunakan konsep momentum dan inersia, terangkan mengapa had laju dan had
muatan mesti dikenakan ke atas kenderaan berat [ 5 markah ]
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-speed limit imposed to prevent high momentum of vehicle, due to high velocity, it is hard to stop the vehicle -momentum is the combination of mass and velocity -load limit imposed to prevent high inertia of vehicle move at fast acceleration and cause it hard to stop it in a short time
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-short and round = to protect the head if there is any impact and aerofoil shape to increase lifting force when cycling -material interior shell is polystryrene =to prevent head injuries, reduce impulsive force and light in weight -wide strip = hold the helmet and head tightly -air hole present = for air flow and cooling effect on cyclist -the best is N helmet with Polystyrene material interior shell, short and round front end, air hole present and wide strap
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-THE LAYER OF AIR NEAR THE GROUND IS HOTTER -the layer of air near the ground is less dense - light ray from sky through layer of air is refracted from normal -light experience total internal reflection when incident angle is greater than critical angle
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-states that pressure of moving liquid decreases, as speed liquid increases or vice versa
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-speed of air on upper roof is higher -pressure of upper roof is lower -differences air pressure between upper part and lower part produces lifting force -F= difference Px A
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-when cathode ray heated electrons emitted from surface/ thermionic emission -electrons accelerated to anode -electrons travel in straight line -electrons stopped by cross Maltase produce shadow
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8.
Diagram 10.1 Diagram 10.2
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The production of electric current by a changing of magnetic field
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the number of conductor wires in Dia 10.2 is greater than in Dia 10.1
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the deflection of galvanometer in Dia 10.2 is higher than in Dia 10.1
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the greater the number of conductors, the higher the rate of cutting of magnetic flux
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the higher the rate of cutting of magnetic flux, the higher the induced current
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Faraday's law
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1. curve magnet- produce radial magnetic field with uniform magnetic field which concentrate the induced curent after the cutting of magnetic field and produces effective induced current 2. more number of coils- more induced current generate due to the rate of cutting of magnetic field 3. soft iron core-greater magnetic field strength produces with greater force on the conductor and generate greater induced current. 4.carbon brush- reduce friction, produces effective continously induced current.
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-less thick of diaphragm = to get effective vibration and able to detect vibration of sond wave in short time -strong diaphragm = to withstand high vibration and prevent it from tearing off -small diameter of coil =to concentrate the sound wave to vibrate the diaphragm to cut the magnetic field effectively - high number of turns =to increase the magnetic strength and generate more current due to cut of magnetic field Faraday law -soft iron core =magnetize and demagnetize easily to produce uniform and stable electric field-
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9.
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a bulb supply with 9 V when 20 J of energy supply in a second
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P= V/I 20 = 9/I I = 20/9 = 2.22 A
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R= V/I = 9/ 2.22 = 4.05 ohm
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more thicker of wire, lower loss of energy in filament
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Ep = 15/20 x 100% = 75.00 % Eq = 28/30 x 100% = 93.33 % Er = 43/50 x100 % = 86.00%
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Filament Q has highest efficiency
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the region which a material experience magnetic force
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-no of turns of coils in D 10.2 is greater than 10.1 - patttern of magnetic field in D 10.2 is denser than 10.1 -deflection of ammeter in D10.2 is bigger than 10.1
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- the closer the pattern magnetic field, the greater the strengh of magnetic field -, the higher the no of turns, the higher the strength of magnetic field
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10 marks
11.
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- more turns, increase strength of magnetic field, increase speed of motor - commutator, reverse current flow in coil( ensure core rotate in one direction -brush, enable current flow through coil -semicircular magnet, produce radial magnetic field -soft iron core, concentrate magnetic field
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-light with one colour/ one wavelength/ one frequency
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red light> blue light
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-both diagram, distance between consecutive fringes are constant -distance between consecutive fringes for red light is more than blue light
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-the longer the wavelength, the larger the distance between consecutive bright fringes
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distance between two consecutive fringes decreases
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x inversely proportional to a
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interference/ diffraction
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-control set of apparatus -determine amount of ice melted due to heat loss from the surrounding
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-both have same reading
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-mass of water in D 6.2 is higher
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-latent heat of fusion
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SEMOGA ANDA BERJAYA DENGAN
CEMERLANG DALAM SPM
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-higher latent heat absorbed, higher mass of water collected
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- mass= (380-180)-(200-180) =180 g
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-Pt= ml 200 (5x 60) =0.18 x l l= 3.33 x 10 5 Jkg-1
