1.1 Numbers and units

What two parts make up a physical quantity?

A number and a unit.

What is the definition of a physical quantity?

A measurement made of a number and a unit (e.g., 10 m).

What is scientific notation (standard form)?

A way to write very large or small numbers using powers of 10.

What do significant figures show in a measurement?

How precise the measurement is.

Front: What is the formula used to calculate speed?

Speed = Distance ÷ Time

Front: What are two common ways to write the unit for speed?

Back: m/s or m s⁻¹

Front: According to the textbook, when should units be included in a physics calculation?

Back: At all stages of the calculation, not just at the end.

Front: What does the prefix Giga (G) mean?

1,000,000,000 (10⁹)

Front: What does the prefix Mega (M) mean?

Back: 1,000,000 (10⁶)

Front: What does the prefix kilo (k) mean?

Back: 1,000 (10³)

Front: What does the prefix centi (c) mean?

Back: 1/100 (10⁻²)

Front: What does the prefix milli (m) mean?

Back: 1/1,000 (10⁻³)

Front: How do you write 320,000 in scientific notation?

Back: 3.2 × 10⁵