1) Physical Quantities 2) Units 3) Measurements

1. SI Units

1.1. 7 Base Units - length (m) - Time (s) - mass (kg) - Electric Current (A) - Temperature (K) - Amount of Substance (mol)

1.2. Derived Quantity (m2)

2. Physical Quantities (e.g 10.0 cm)

2.1. Magnitude (10.0)

2.2. Suitable Units (cm)

2.3. Prefixes

2.4. 1. Scalar quantities are described by a magnitude only.

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

3. Measurement

3.1. Length

3.1.1. Metre Rule (Precision = 0.1 cm)

3.1.2. Vernier Caliper (Precision = 0.01 cm)

3.1.3. Micrometer Screw Gauge (Precision = 0.01 mm)

3.1.4. Zero Error

3.2. Time

3.2.1. Stopwatch

3.2.2. Oscillation of a Pendulum

3.2.2.1. Formula: T =

3.2.3. Ticker Timer