Assignment Prompt & Instructions
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**Mechanics and Energy: Explain What You Learned**
Complete the assigned McGraw Hill Connect activities for Tillery’s _Physical Science_. For each activity, explain the physical science concepts you learned using specific examples from your work.
Use complete sentences and your own words. Explain **what happened, why it happened, and what evidence supports your explanation**. Reporting your score or listing the steps you completed does not demonstrate your understanding.
**Distance-Time Graphs and Velocity-Time Graphs ABA**
Write two or three paragraphs addressing the following:
– Describe the motion examined in the activity.
– Explain what the slope of a distance-time graph tells you about motion. Use one graph from the activity to support your explanation.
– Explain what a horizontal line means on a distance-time graph and on a velocity-time graph. Describe why these interpretations differ.
– Explain how the slope of a velocity-time graph relates to acceleration.
– Use a specific graph to describe how you recognized constant velocity or changing velocity. Discuss direction if the graph provided that information.
– Explain how the area between a velocity-time graph and the time axis relates to displacement, including the meaning of any area below the axis.
Include at least one numerical example from the activity, with units. Clearly distinguish distance, displacement, speed, velocity, and acceleration when those quantities appear in your explanation.
**Momentum ABA**
Write two or three paragraphs addressing the following:
– Describe the situation presented in the activity.
– Explain how mass and velocity determine momentum using **p = mv**.
– Use a specific example to explain how changing mass or velocity affected momentum. Include values and units when available.
– Explain why direction matters when discussing momentum.
– If the activity included a collision, explain how the total momentum before the collision compared with the total momentum afterward. Identify the system being considered.
– Explain the conditions under which momentum is conserved. If relevant to your activity, discuss how an external force or the duration of a collision affected the outcome.
Describe one prediction you made and explain whether the activity’s results supported it.
**Inverse Square Laws 1 ABA**
Write two or three paragraphs addressing the following:
– Identify the physical quantity examined in the activity and explain how it depended on distance.
– Explain an inverse square relationship in your own words.
– Explain what happens to the quantity when distance is doubled, tripled, or reduced to half its original value.
– Show one calculation using values from the activity. Include units and explain your reasoning.
– Explain why doubling distance does not simply cut the quantity in half.
– Describe one practical application of the relationship examined in the activity.
State the conditions under which the inverse square relationship applied in your example.
**Mechanics Lab Report One**
Follow the assigned laboratory procedure and submit a report that includes:
1. **Purpose:** State the question investigated and the mechanics concept being tested.
2. **Prediction:** Describe the expected result and explain the physical reasoning behind it.
3. **Method:** Summarize what you did in enough detail for another student to understand how you collected the data. Identify what you changed, what you measured, and what you kept constant, as applicable.
4. **Results:** Present your actual measurements in a labeled table with units. Include required graphs and show one sample of each type of calculation.
5. **Analysis:** Explain the patterns in your results and how they relate to the relevant physical science principles. Compare your results with your prediction.
6. **Limitations:** Identify a specific source of uncertainty or a limitation of the procedure. Explain how it could affect the results and suggest an improvement.
7. **Conclusion:** Answer the investigation’s question using evidence from your data. Explain what you learned and how the laboratory connects to a related Connect activity.
Distinguish your observations from your explanations. Support conclusions with measurements rather than statements such as “the experiment worked.”
**Energy Sources ABA**
Write two or three paragraphs addressing the following:
– Identify the energy sources evaluated in the activity.
– Explain how at least two sources provide usable energy. Describe the energy transformations involved.
– Classify those sources as renewable or nonrenewable and explain your reasoning.
– Compare the sources using at least three relevant factors, such as cost, reliability, resource availability, environmental effects, or greenhouse gas emissions.
– Use one specific value, comparison, or piece of evidence from the activity to support your discussion.
– Explain which source or combination of sources you would recommend for the situation presented. Acknowledge a tradeoff associated with your choice.
Explain why a source being renewable does not mean it has no environmental effects.
**Work-Energy Theorem ABA**
Write two or three paragraphs addressing the following:
– Describe the situation investigated in the activity.
– Explain the scientific meaning of work and how force and displacement determine it.
– Explain the work-energy theorem: **net work equals the change in kinetic energy**, or **W_net = ΔKE**.
– Use one example from the activity to explain how positive, negative, or zero net work affected an object’s kinetic energy.
– Show one calculation using actual values from the activity. Include units and explain what the result means.
– Explain how mass and speed affect kinetic energy using **KE = ½mv²**.
– Identify the forces that contributed to the net work in your example. Discuss friction if it appeared in the activity.
Clearly distinguish the work done by an individual force from the net work done by all forces.
**Before Submitting**
For each response, check that you have:
– Used specific examples from the assigned activity.
– Included units with numerical quantities.
– Explained the reasoning behind a calculation, prediction, or conclusion.
– Identified a concept that became clearer or a mistake you corrected.
– Used only data and situations that actually appeared in your work.
Your goal is to demonstrate that you can use physical science concepts to explain the results, not simply repeat definitions.