p2-130913114308-phpapp02.pptx for grade 7
- 1. Warmup How do you define the word “Model”? In science, what does model means? If we study cell, atom, volcano, ecosystem, state/phase of matter, how do we relate it to the word ‘model’?
- 2. Objectives: 1. Explain how models are used to represent the natural world. 2. Identify three types of scientific models. 3. Describe theories and laws.
- 3. Types of Models Model A representation of an object or a system. 1. Physical Models ○ look like the thing they represent ○ For example, the model volcano looks like a real one but won’t destroy acres of forests.
- 4. 2. Mathematical Models ○ Made up of mathematical equations and data. 3. Conceptual Models ○ Systems of ideas or are based on making comparisons with familiar things to explain an idea. Explains the origin of the universe
- 5. Models are just the right size Often used to represent things that are very small or very large. Useful for studying cells and particles of matter that are too small to see with the unaided eye. Also useful for studying objects that are too large to see completely such as the Earth or the solar system.
- 7. Models build scientific knowledge Often used to help illustrate and explain scientific theories. Theory ○ Explanation that ties a broad range of hypotheses and observations that have been supported by testing. ○ Can also be used to predict what will happen in future Theories and models can change as new observations are made. Charles Darwin’s Theory of Evolution 1897 Model of Atom Current Model of Atom
- 8. Scientific Laws Formed when a theory and its models correctly predict the results of many different experiments. Law is defined as: A summary of many experimental results and observations. Laws are not the same as theories. Laws tell you only what happens, not why it happens.