Bell Ringer Quick Write – With your group, why is it important to make accurate measurements when conducting a scientific investigation? Write your answer on the White Board. https://www.youtube.com/watch?v=cQGW2HDZNGc

Measuring Mass *Mass – The amount of matter in an object or substance *Tool used – Triple-beam balance Units - Milligram (mg) Gram (g) Kilogram (kg)

1 kg = 2.2 lbs Ex. – 100 lbs = 45.5 kg 100 kg = 220 lbs

Other Measuring Instruments

How to use the Triple-beam balance

How to use the Triple-beam balance https://www.youtube.com/watch?v=FfuBO3-K8AQ

1. Slide the middle slider (largest) to the right until the arm drops below the center line. Then slide the slider back one spot to the left. Make sure the slider fits into the groove on the arm.

2. Do the same thing with the back slider (mid-size).

3. Do the same thing with the front slider (smallest).

4. Add up the values of the weights to get the total mass. 100 + 30 + 7.4 = 137.4 g (grams)

Let’s Practice It

Closing Quick Write – Why is it important to make accurate measurements when conducting a scientific investigation? *Write your answer below your notes.