Accuracy, Precision and Reaction Time

What does precision refer to in measurements?

• How close a measurement is to the true value

• The number of significant figures in a measurement

• The average of multiple measurements

• The difference between two measurements

Why is accuracy important in timing a race?

• It shows how fast the runner is

• It determines who wins the race

• It affects the runner's training

• It helps with the runner's nutrition

What is reaction time?

• The time taken to complete a race

• The time it takes to process information and respond

• The time it takes to measure something

• The time taken to travel a distance

If a runner's reaction time is 0.2 seconds, how does this affect their race time?

• It makes their time shorter

• It has no effect on their time

• It makes their time longer

• It only affects their speed

What happens when a judge uses a stopwatch to time a race?

• Their reaction time makes the reading more accurate

• Their reaction time can lead to an inaccurate reading

• They can see the finish line better

• They always get the exact time

In the 2012 Olympics, Usain Bolt's time was recorded as 9.63 seconds. If it were recorded as 9.7 seconds, what would happen?

• It would be more precise

• It would be less accurate

• It would be more accurate

• It would have the same accuracy

Why might automatic timing be more accurate than using a stopwatch?

• It eliminates reaction time delays

• It is easier to use

• It can measure longer distances

• It requires less training

What is the typical reaction time for a human being when responding to a stimulus?

• 0.1 s

• 0.2 s

• 0.5 s

• 1 s

The exact measurement of the length of a table is 1.25 m.

Categorise the readings on the left into the following categories.

Groups:

(a) 1.23 m

,

(b) 1 m

,

(c) 0.95 m

• Low accuracy High precision

• Low accuracy Low precision

• High accuracy High precision