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1) Physical Quantities 2) Units 3) Measurements by Mind Map: 1) Physical Quantities
2) Units
3) Measurements
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1) Physical Quantities 2) Units 3) Measurements

Physical Quantities (e.g 10.0 cm)

Magnitude (10.0)

Suitable Units (cm)

Prefixes

1. Scalar quantities are described by a magnitude only.

2. Vector quantities are described by both magnitude and direction.

SI Units

7 Base Units - length (m) - Time (s) - mass (kg) - Electric Current (A) - Temperature (K) - Amount of Substance (mol)

Derived Quantity (m2)

Measurement

Length

Metre Rule (Precision = 0.1 cm)

Vernier Caliper (Precision = 0.01 cm)

Micrometer Screw Gauge (Precision = 0.01 mm)

Zero Error

Time

Stopwatch

Oscillation of a Pendulum, Formula: T =

Ticker Timer