Standard Units (SI)

Standard Units (SI)

Reviewing the International System of Units: English and Metric

What are units?

Units are how scientists describe what kind of thing is being measured

Examples of units in daily life

• 35 mph. The speed limit is measured in the units of miles/hr

• 150 lbs. The weight was measured in pounds

• Both Miles and Pounds are 'English' units

• In the USA, we tend to use 'English' units for daily life

• In science, metric units are more commonly used, so we need to know what English and Metric units are.

SI for the first half of class (Graphing & Movement)

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• We need to be able to measure distance

• We also need to be able to measure mass and weight

Poll

What is a kilogram?

• A unit of weight or mass

• A unit of distance

Multiple Select

Which of these are metric units of weight/mass?

• kilometer

• kilogram

• milligram

• centimeter

Multiple Choice

If the metric unit ends with 'gram', what does it measure?

• weight/mass

• distance

• volume

The metric system is very logical

• If the unit ends with 'gram' it measures weight/mass

• If the unit ends with 'liter' it measures volume

• If the unit ends with 'meter' it measures distance

Multiple Choice

If a metric unit ends with 'meter', what does it measure?

• distance

• time

• weight/mass

• volume

Other Units

There are other units in physical science, but we will discuss them as we get to that section of the class. For now, focus on distance and weight.