Scientific Measurement

Measurements help scientists be exact in their _______________

• Understanding
• Theories
• Observations
• Knowledge

What are the standard units for measurement in Science?

• Inch, foot, mile, pound
• Metre, kilogram, cubic metre, litre

What number does Kilo stand for?

• Ten
• One Thousand
• Ten Thousand

Is it better for a scientist to do an experiment only once, or more than once?

• Once
• More than once

When a scientist does an experiment multiple times, and gets a slightly different number as a result each time, what should they do?

• Write down every number as a possible answer
• Average the numbers, and record the average
• Record all the numbers added up together
• Decide which number they think is the closest to correct

How do you average a number?

• Add it up into one big number
• Choose the number closest to the "in between" answer.
• Add up all the numbers, then divide by how many numbers there are
• Subtract the smallest number from the biggest number

Let's practice: A sports-focused scientist is testing how far a soccer ball will roll on mowed grass when hit by a mechanical foot. The first time the foot kicks it the ball rolls 3 metres, the second time the ball rolls 4 metres, the third time the ball rolls 2 metres. What is the average length the ball will roll in metres?

• 3 + 4 + 2 = 9....9÷3 = 3
• 3 + 4 + 2 = 10....10÷3 = 3.3
• 3 + 4 + 2 = 9.....9÷3 = 4.5
• 3 + 4 + 2 = 10....10÷3 = 4

Metres are used to measure 

• Weight
• Mass
• Length

Mass is usually measured by the _____gram

• Milli
• Kilo
• Mega

Finding the average allows scientists to get more ____________ results

• Reviewed
• Literary
• Accurate