Section 1-2 Teaching Outline

Book K

Anticipatory Set

Do Discovery Activity p 22K

Items used: plastic beakers, lead tire weights, wood blocks, copper blocks.

Procedure: (will need a sheet of paper and something to write with)

  1. Hold them up to the class, and have each team list from heaviest to lightest the order they think the items should go in.
  2. Hold up triple beam balance and describe how to use it as a review. (Make sure that you discuss accuracy of measurement)
  3. Have each person weigh and record each item. (Average their measurements put on board to compare accuracy).
  4. Compare actual weights to the order they originally decided. See if they were wrong. Discuss why?

Assign Reading

Go over reading hints p.22

Give out the outline 1-2. Discuss objectives

Mass

Define mass and units.

Review metrics and unit meanings

Unit: Milligram centigram gram kilogram

Symbol: Mg cg g kg

Meaning: 1/1000g 1/100g 1g 1000g

cg

mg

Show how to convert by adding or subtracting 0’s.

Discuss tools used to measure mass and weight (spring balance, triple beam balance)

Demonstrate using spring scales to determine weight. Discuss how weight and mass are measured differently. Moon, Jupiter, Mountain top, etc.

Mass Activity:

Convert measurements of the Discovery Objects to mg, cg, g, and kg

Volume:

Define volume

Discuss units of volume, liters, cc. (do chart like for mass)

Show tools used to measure volume, Graduated cylinder, syringe, beaker, ruler

Volume Activity: Demonstrate/model each step

Measure the volume of the copper block

Use ruler (each person then average volume)

Use Graduated cylinder each person then average volume) Put water into beaker to pour into graduate cylinder.

Ask which method was most consistant? Why?

Because the more the more measurements you make the more chance you have to make an error.

In Your Journal:

Look at the history time line. Pick one measurement and describe if it is more. Less or as accurate as todays measurement. Describe the change that the world would have if we switched back to this measurement and the effects. Ask if anyone knows what a fathom, furlong, or knot is) see facts and figures teachers edition p. TE 24 k

Density:

As we saw in the mass activity, objects of differnet sizes can weigh different amounts and large things may not weigh as much as small things. (What weighs more a pound of feathers or a pound of lead? Which is larger?

The way we determine density is with a formula Density = mass/volume

p. 27 K has an example of how the problem is solved.

Assignment

DO the 2 practice problems on p. K27 in 4 steps as shown.

1: Givens 3: put givens in formula

2: Formula 4: answer and circle

Activity

Density Lab