Student Unit U3
The Power of Per
Unit U3 Focus Words
per
preposition – for each
How many hours of TV do you watch per week?
speed
noun – the rate at which something moves
Which is faster: the speed of light or the speed of sound?
rate
noun – a comparison of two different units to give information
Distance traveled compared to time tells the rate of speed. Do you know what mph stands for? Hint: The speed limit of many highways is 65 mph.
ratio
noun – a comparison of two amounts
What is the ratio of boys to girls in your classroom?
frequency
noun – the number of times that something happens within a particular period
What is the frequency at which you send text messages?
accuracy
noun – correctness in every detail
In which sports is accuracy crucial?
precision
noun – the state of being very exact
Why is precision important when conducting a scientific investigation?
pace
noun – the speed or rate at which something is done
At what pace can you run continuously for 30 minutes?
correlate
verb – to have a relationship where two or more things happen or change together
Why do you think obesity correlates with increased risk of a heart attack?