Coral squeezes a power drill's trigger. The bit spins 20 times each second.
That each-second count also deserves a name.
The frequency's symbol is a lowercase f.
Frequency is measured in hertz, written Hz.
A frequency of 1 Hz means one complete revolution each second.
The drill bit completes 20 revolutions each second, so its frequency is f = 20 Hz.
The hertz counts happenings each second. In this topic, the happening is a revolution; later topics count other repeats with the same unit.
A faster spin packs more revolutions into each second: a greater frequency.
A blender blade completes 45 revolutions each second. What is its frequency?
Dagny says: 'A sprinkler head that completes 3 revolutions each second has a frequency of 3 Hz.' Is Dagny correct?
A box fan on its high setting completes 15 revolutions each second. State its frequency.
The each-second count is 15 revolutions.
The fan's frequency is f = 15 Hz.
The same fan on its low setting completes 5 revolutions each second. State its frequency now.
The each-second count is now 5 revolutions.
A slower spin means a lower frequency.
The fan's frequency is now f = 5 Hz.
Four facts are recorded about a potter's wheel. Which one states its frequency?
Bruno measures a spinning ride's frequency. Which unit does he record?
A ceiling fan's frequency is 4 Hz. Which statement is correct?
The number of complete revolutions an object makes each second is called its ___.