 When we measure you need to know: › What you are measuring (the object) › › What you are measuring with (which tool) What you are measuring in (the units)  If you don’t use units, I won’t know what you are talking about!

   What does it measure?

› Distance between two points   Can measure VERY tiny objects Can measure great distances What tools do we use?

› › Metric Ruler Meter stick What units do we use?

› SI base unit is the

meter

 Use the ruler to measure the items at your lab station. Record your measurements on your notes.

 Use the meter stick to measure the height of your desk.

  How much space an object takes up Two ways to measure volume › › Length x width x height  Only if it is square or rectangle Volume by Immersion  Place the object into a beaker of water and subtract to find the volume.

  What tools do we use?

› Rectangular objects ›   Ruler Meter Stick Irregular objects  Beaker (immersion) What units do we use?

› There are 3 units we use in this class  Meter cubed (m 3 )   Centimeter cubed (cm 3 ) Milliliters (mL)

 Use the ruler to measure the length width and height of items at your lab station. Multiply the numbers to find the volume. Record your measurement on your notes.

  Read the volume in the beaker Practice immersion technique using the bead and the graduated cylinder

   Measures how much matter is in an object › Mass does not change when you change location What tools do we use?

› › Triple Beam Balance Pan Balance › Electronic Balance What units do we use?

› The SI unit for mass is kilogram

 Use the balances at your station to measure each item › Triple beam balance to find the mass of the wooden block.

› Pan balance to find the mass of the ball.

   Measures the amount of force (gravity) acting on an object › Your weight can change depending where you are What tools do we use?

› Spring Scale What units do we use?

› The SI unit for weight is Newton (N)

 Use the spring scales at your station to: › Measure the weight of the wood block with this scale.

   How hot or cold something is › Measures the kinetic energy (energy of motion) of an object.

What tools do we use?

› › Digital thermometer Alcohol thermometer What units do we use?

› The SI unit for temperature is Kelvin › However, we use Celsius in class

  Use the thermometers by the reading center to measure the following: Record your measurements on your notes.

› Digital thermometer: beaker of water › Alcohol thermometer: body temperature (hold it in your closed hand)

   The interval between 2 events › Time can also measure rate What tools do we use?

› Stop watch What units do we use?

› The SI unit for time is seconds

 Using the stop watch at your station, measure the following. Record your measurements on your notes.

› How long it takes you to walk from the front of the room to the back of the room.

  What are the 6 things we will measure in here?

Why is it important to use units when writing down measurements?