T. Trimpe Lesson 1: Length
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1 T. Trimpe Lesson 1: Length
2 Metric Units The basic unit of length in the metric system is the meter and is represented by a lowercase m. Metric Units 1 Kilometer (km) = 1000 meters 1 Meter = 100 Centimeters (cm) 1 Meter = 1000 Millimeters (mm) Which is larger? A. 1 meter or 105 centimeters B. 4 kilometers or 4400 meters C. 12 centimeters or 102 millimeters D millimeters or 1 meter
3 How many millimeters are in 1 centimeter? 1 centimeter = 10 millimeters Measuring Length What is the length of the line in centimeters? cm What is the length of the line in millimeters? mm When using the ruler always start measuring at 0!!!
4 STOP AND PRACTICE Find the length (long edge) of the aluminum block and the copper rod in both centimeters and millimeters Aluminum block: 8.8 cm or 88 mm 8.7 cm to 8.9 cm or 87mm to 89 mm is okay! Copper rod: 5 cm or 50 mm 4.7 cm to 5.1 cm or 47mm to 51 mm is okay!
5 T. Trimpe Lesson 2: Mass
6 Metric Units Mass refers to the amount of matter in an object. The base unit of mass in the metric system is gram and is represented by g. (1 paperclip is about 1 gram) Metric Units 1 Kilogram (kg) = 1000 Grams (g) 1 Gram (g) = 1,000 Milligrams (mg) Which is larger? A. 1 kilogram or 1500 grams B milligrams or 1 gram C. 12 milligrams or 12 kilograms D. 4 kilograms or 4500 grams
7 Measuring Mass We will be using triple-beam balances to find the mass of various objects. The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up.
8 Using a triple beam balance Reminders! 1. Carry the balance with both hands! 2. Make sure the balance is at zero before you begin Show video on green flash drive
9 How to use the triple beam balance 1. Place item on the balance 2. Start with the hundreds place and move the weight until you ve gone too far. Then move it back to the spot before. Make sure the weight is sitting in the groove! For example, if 300 grams is too much, put the weight back at 200 grams. 3. Repeat step two with the tens place. 4. With the ones weight, you will move it very carefully until the lines line up. 5. Add up the hundreds, tens, ones, and tenths place for your final mass! 6. Return all sliders to zero when you are done!.
10 Once you have balanced the scale, you add up the amounts on each beam to find the total mass. What would be the mass of the object measured in the picture? + + = g
11 What does the balance read? /-----/-----/-----/-----/-----/-----/-----/-----/ Answer: 3.8 grams V
12 What does the balance read? V 100g 200g 300g 400g 500g 10g 20g 30g 40g 50g 60g 70g 80g 90g 100g V /-----/-----/-----/-----/-----/-----/-----/-----/ V = 265.6g
13 What does the balance read? V 100g 200g 300g 400g 500g V 10g 20g 30g 40g 50g 60g 70g 80g 90g V /-----/-----/-----/-----/-----/-----/-----/-----/ g
14 What does the balance read? V 100g 200g 300g 400g 500g V 10g 20g 30g 40g 50g 60g 70g 80g 90g 100g V /-----/-----/-----/-----/-----/-----/-----/-----/ g
15 STOP AND PRACTICE Find the mass of the aluminum block and the copper rod. One partner will do one, the other partner does the other. Watch and double check each other! When you finish, please return all equipment except your rulers Aluminum block: 39.4 g 38.4 g to 40.4 g is okay! Copper rod: 55.7 g 54.7 g to 56.7 g is okay!
16 T. Trimpe Lesson 3: Volume
17 Metric Units Volume is the amount of space an object takes up. The base unit of volume in the metric system is the liter and is represented by L Metric Units 1 liter (L) = 1000 milliliters (ml) Which is larger? A. 1 liter or 1500 milliliters B. 200 milliliters or 1.2 liters
18 Measuring Volume We will be using graduated cylinders to find the volume of liquids and irregularly shaped objects. Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water. What causes the meniscus? A concave meniscus occurs when the molecules of the liquid attract those of the container. The plastic or glass attracts the water on the sides.
19 What is the volume of water 43 in the cylinder? ml
20 76 ml 56 ml
21 4.35 ml 32 ml
22 We measure the volume of a solid, irregularly shaped object using the graduated cylinders in a process called the water displacement method. Volume of H 2 O with the object - Volume of H 2 O without object Volume of the object
23 Volume of Irregular Objects A rock was placed into a graduated cylinder containing 100 milliliters of water. The diagram to the right illustrates the new level of water. What is the volume of the rock? (A) 41 ml (C) 42 ml (B) 141 ml (D) 142 ml
24 Volume of Irregular Objects A rock was placed into a graduated cylinder containing 100 milliliters of water. The diagram to the right illustrates the new level of water. What is the volume of the rock? (C) 42 ml 142 ml (end) 100 ml (start) = 42 ml Each line = 2 ml increments
25 Practice: Find the volume of the copper rod using the displacement method Try it at least twice to verify your answer! Answer: 6 ml
26 Measuring Solid Volume We can measure the volume of regularly shaped solid objects using the formula: Volume = length x width x height. 10 cm 8 cm 9 cm 720 cm 3 X X = 9 cm 1 milliliter (ml) = 1 cm 3 (or cc) 10 cm 8 cm
27 The unit for each measurement is cm.
28 Practice! Find the volume of the aluminum block using a ruler and a calculator (make your measurements in cm) Volume of Aluminum block: 8.8 cm x 2.5 cm x 0.6 cm = 13.2 cm 3 If you were a mm off on each measurement 8.9 x 2.6 x 0.7 = cm 3 Your answer would have been 3 cm 3 off!
29 Your turn to practice. Activities A, B, and C are done INDIVIDUALLY! If you have form 1, you will start with activity A and complete it at your desk. You need: 1. The plastic beaker filled half way with water 2. pipette ml graduated cylinder If you have form 2, you will start with activity A at the back counter. You need: ml graduated cylinder 2. 3 Nuts 3. pipette *If you finish, go on and do B while you wait for your partner to finish their part so that you can swap equipment and working areas!
T. Trimpe Lesson 1: Length
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