Presentation on theme: "Becoming a Scientist Learning to solve questions using the scientific method."— Presentation transcript:
Becoming a Scientist Learning to solve questions using the scientific method
When we Discover something new… Become curious and develop questions… Hypothesize a likely answer... Design an experiment and collect data…. And make conclusions When we Discover something new… Become curious and develop questions… Hypothesize a likely answer... Design an experiment and collect data…. And make conclusions
You don’t want to “reinvent the wheel” For K-12, teachers may choose to inform students about this background knowledge..
For example, we can learn about how Sabre-Tooth’s relatives hunt today Background research helps to create a better hypothesis Cheetahs pounce on GazelleLions jump on to elephant’s back
Prehistoric Elk Megalocerus The Wooly Mammoth Mammuthus primigenius The more background that we learn the better we can predict the outcome. We also create opportunities to engage student interests!!
1. An educated prediction based on observation 2. Prediction can be tested Data is feasible to obtain 3. Prediction is Specific Hypotheses are not vague
The teeth of Sabre-Tooth were too long and delicate to break the bones of Wolly mammoth or Prehistoric Elk Identify the test subject, what we will test, and what we will test it on.
We obviously don’t have sabre-toothed teeth or mammoth bones for our research, but we can build a model.
For example, We Need…. 1. A modeled Sabre-tooth 2. A modeled mammoth and deer bone 3. A negative and positive control 4. A way to repeat the experiment For example, We Need…. 1. A modeled Sabre-tooth 2. A modeled mammoth and deer bone 3. A negative and positive control 4. A way to repeat the experiment
Simple models using wood and large screws or Paper Mache could be used to recreate Sabre-Tooth teeth. These teeth were 8 inches long and sharp!!
Find bones from Petsmart, or make them from paper mache. Have students brainstorm ways to test their hypothesis
Positive Control Hyena teeth model (known for crushing bones) Negative Control Wood with no teeth Controls are needed to show the experiment worked correctly!
Saber-toothNegative Control (No teeth) Positive Control (Hyena Teeth) Mammoth Bone Test 1 Mammoth Bone Test 2 Mammoth Bone Test 3 Deer Bone Test 1 Deer Bone Test 2 Deer Bone Test 3
Have the students devise a consistent method to crush/break the bones using their model Record data in tables and lab notebooks
Analyze controls Positive control should break the bones. ▪ If it doesn’t perhaps model is too weak Negative control should not break the bones ▪ If it does perhaps model is too strong Analyze experimental group Sabre-tooth broke bones, broke bones sometimes, or did not break bones.