Page 3 - 1202 Question Bank Physics Form 5

MUST

KNOW Mnemonics

Triangle of Forces Fleming’s Left-hand Rule

Triangle of forces:
• is a vector diagram whose sides represent three forces in The direction of the force can be determined by using Fleming’s
left-hand rule.
equilibrium.
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• is a closed circle with forces in clockwise or in anticlockwise
direction. Force, F Magnetic field, B

F
2 a
F F F
1 = 2 = 3 Current, I
c (q) sin a sin b sin c
F F = F + F + 2F F cos q
2
2
2
3
3 1 2 1 2
F
1
b Fleming’s left-hand rule → FBI
Mnemonics (Chapter 1) 1 @ Pan Asia Publications Sdn. Bhd. Mnemonics (Chapter 4) 7 @ Pan Asia Publications Sdn. Bhd.

Factors Affecting Resistance of Wire Fleming’s Right-hand Rule
The direction of the induced current in a conductor can be
determined by using Fleming’s right-hand rule.
Mnemonic Factors
Last Length of wire, L Thumb
First finger
Rocket Resistivity of wire, r Movement
Magnetic field
Cross Cross-section of wire, A

Tower Temperature of wire, q
Current is
affected
Second finger

Mnemonics (Chapter 3) 3 @ Pan Asia Publications Sdn. Bhd. Mnemonics (Chapter 4) 9 @ Pan Asia Publications Sdn. Bhd.

Current and Potential Difference npn Transistor and pnp Transistor

Electrons flow from the Negative to the Positive terminal ˜ ENP Collector Emitter Collector Emitter
C n P n E C P n P E
Current flow from the Positive to the Negative terminal ˜ CPN
B Base B Base
C C

B B

E E
npn transistor pnp transistor
Not Pointing IN Pointing IN

 Mnemonics (Chapter 5) 5 @ Pan Asia Publications Sdn. Bhd. Mnemonics (Chapter 5) 11 @ Pan Asia Publications Sdn. Bhd.

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