Lecture 3 SI Units Ozgur Unal NIS – PHYSICAL SCIENCE Lecture 3 SI Units Ozgur Unal

NIS – PHYSICAL SCIENCE Lesson Objectives: Identify SI units and symbols for length, volume, mass, density time and temperature. Measure the volume of an object with an irregular shape. Calculate density of an object.

SI UNITS Measuring distance: Length is the distance between two points. In SI, we use meter (m) to measure distances. Measure the length of your pencil using your rulers Measuring volume: Volume is the amount of space occupied by an object. For objects with regular sizes (such as a brick), you can calculate the volume. Volume of a liquid is expressed in liters. 1 L = 1 dm3

SI UNITS Measuring matter: Mass is a measurement of the quantity of matter in an object. Unit of mass in SI is kilograms (kg) Density Density is the mass per unit volume of a material. density = mass / volume Check Table 3 on page 19 for densities of different materials

SI UNITS Measuring time: It is sometimes necessary to measure the amount of time between events. SI unit of time is second (s). Measuring temperature: Temperature tells you how hot or cold an object is. Different units for temperature (Celsius, Kelvin, Fahrenheit). SI unit of temperature is Kelvin (K). In K scale, water freezes at 273 K and boils at 373 K. You can convert between units doing some calculations.

Minilab Minilab: Read the minilab on page 19. Form groups of 2 or 3. Instead of a pencil use the item given to you and follow the instructions. Answer “Analysis” questions. Clean up your desk after the minilab.

Lecture 4 Communicating With Graphs Ozgur Unal NIS – PHYSICAL SCIENCE Lecture 4 Communicating With Graphs Ozgur Unal

NIS – PHYSICAL SCIENCE Lesson Objectives: Identify the three types of graphs and explain the ways they are used. Distinguish between dependent and independent variables. Analyze data using the various types of graphs.

Graphs A graph is a visual display of data. Graphs are useful for displaying numerical information in business, science, sports, medicine etc. Three different types of graphs: Line, Bar and Circle

Line Graphs A line graph shows the relationship between two variables: Dependent and independent variables. Most of the time the independent variable is the time. Check Table 4 and Figure 18. Place the independent variable on the x-axis. Make sure to label the axis with appropriate units. Consecutive numbers should be evenly spaced. Example: Seed growth Type of seed Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Control 1 8 15 Sanded 3 9 12 24 Nicked 4 7 19 29

Bar and Circle Graphs A bar graph is useful for comparing information collected by counting. Each bar represents a quantity counted. Place the independent variable on the x-axis. Example: Number of students in each grade. A circle graph (or a pie graph) is used to show how some fixed quantity is broken down into parts. Check Figure 21 on page 26. To create a circle graph, start with the total amount, and then calculate the ratio of each component in the total. Find out the angles for each pie.

Some data can be shown by more than one type of graph. Using Graphs Some data can be shown by more than one type of graph.