Measurement What you need to know about this process skill

Use a ruler Be sure to line up your ruler with the edge of what is to be measured. Be sure to line up your ruler with the edge of what is to be measured. This line measures 6.5 cm. This line measures 6.5 cm.

Calculate Area 6.1 cm X 2.5 cm Measure the length and the width and multiply 6.1 X 2.5 = cm 2 Of a Rectangle Unit of Area = Square Centimeters (cm 2 )

Practice area Check answer on last slide. Check answer on last slide. 16 cm 4.5 cm Area = length x width

Calculate Area of a Triangle Area = ½ Base X height Area = ½ Base X height 5cm Height 8cm – Base 20cm 2 9cm - height 6 cm - Base 27cm 2 A = ½ (8 x 5) = ½ (40) = 20cm 2 A = ½ (6 x 9) = ½(54) = 27cm 2

Practice Area Check answers on last slide. Check answers on last slide. 9m 14 m Area = ½ base x height

Calculate the Volume of a Box Volume = l x w x h = length x width x height Volume = l x w x h = length x width x height The unit of volume is cubic centimeters (cm 3 ) The unit of volume is cubic centimeters (cm 3 ) l = 30cm w = 8cm h = 10cm Volume = 30 x 8 x 10 =240 cm 3

Practice Volume Check Answers on last side. Check Answers on last side. 5 m 21 m Volume = length x width x height

Area of a Circle Area of a circle is found by multiplying the radius by itself and then by Pi The Formula is A = Πr 2 To find the radius, divide the circumference by Pi and then divide by 2 For these questions use Pi = 3.14 The circumference is the distance around the circle

Practice area of a circle If the circumference is 11 in., what is the area of the circle? First: find the Radius… C (circumference) = πd or π x d d = c divided by 3.14 r = d divided by 2 Now find the area… A (area) = πr 2 or π x r x r and Remember that Π = 3.14 *Round your answer to the thousandths place

Weight vs. Mass Weight is the measure of the force of gravity. Weight is the measure of the force of gravity. We usually think of it in pounds and ounces. We usually think of it in pounds and ounces. In the metric system, it is measured in “Newtons” In the metric system, it is measured in “Newtons” Mass is the amount of matter in an object. Mass is the amount of matter in an object. It is usually measured in grams and kilograms. It is usually measured in grams and kilograms.

Weight will change on other planets. If you went to the moon, your weight would be less. 1/6 of that on Earth. If you went to the moon, your weight would be less. 1/6 of that on Earth. The moon is smaller, so its gravitational force is lower. Therefore your weight is lower. The moon is smaller, so its gravitational force is lower. Therefore your weight is lower. If you went to the moon, your mass would be the same. If you went to the moon, your mass would be the same. The amount of matter in your body has not changed, so your mass has not changed. The amount of matter in your body has not changed, so your mass has not changed.

Gravity Gravity affects your weight. Gravity affects your weight. But, gravity pulls on all objects equally. But, gravity pulls on all objects equally. If you drop a golf ball and a bowling ball from the same height, they will hit the ground at the same time. If you drop a golf ball and a bowling ball from the same height, they will hit the ground at the same time. Acceleration due to gravity is 9.8m/s 2. This is true for objects of every side. Acceleration due to gravity is 9.8m/s 2. This is true for objects of every side. (Air resistance will play a role, but that is a topic for another time.) (Air resistance will play a role, but that is a topic for another time.)

Measuring Time You can measure time using a stopwatch. You can measure time using a stopwatch. For events that happen quickly, time can be measured in seconds. For events that happen quickly, time can be measured in seconds. You can measure the time it takes you to clap once by measuring how long it takes to clap 10 times and divide your time by 10. You can measure the time it takes you to clap once by measuring how long it takes to clap 10 times and divide your time by 10. Click on stopwatch for an online stopwatch.

Practice Use a ruler to measure the length and width of a textbook. Use a ruler to measure the length and width of a textbook. Calculate the area of the book’s cover. Calculate the area of the book’s cover. Use a ruler to measure the height of the book. Use a ruler to measure the height of the book. Calculate the book’s volume. Calculate the book’s volume. Use your bathroom scale to weigh yourself. Use your bathroom scale to weigh yourself. Use a kitchen scale to weigh your dinner. Use a kitchen scale to weigh your dinner. Use a stopwatch to measure the time of one jump straight up and down. Use a stopwatch to measure the time of one jump straight up and down.

Practice Problem Answers Area = 72 cm 2 Area = 72 cm 2 Area = 63 m 2 Area = 63 m 2 Volume = 525 m 3 Volume = 525 m 3 Area = in 2 Area = in 2