Teacher Demonstration
Use the live model as a shared screen demonstration before students try their own predictions and observations.
Physics / Newtonian Mechanics
Rolling 2 Balls For Modeling Pedagogy
Explore Rolling 2 Balls For Modeling Pedagogy as an interactive EJS simulation for mechanics.
1. Watch or Launch
Launch the Interactive
Open the simulation, adjust the controls, and compare what changes on screen before answering the concept-check questions.
2. Big Ideas
Key idea Acceleration describes how velocity changes with time. Car, bus, and slope models help students compare constant speed, speeding up, slowing down, and changing acceleration.
What Students Can Learn
- Distinguish speed from acceleration.
- Use velocity-time slope to infer acceleration.
- Compare motion on different slopes or with different initial conditions.
- Recognise negative acceleration as change opposite to the chosen positive direction.
Guiding Question
How is velocity changing, and what evidence shows the acceleration?
3. Try the Investigation
Choose the Positive Direction
Define the direction used for positive velocity and acceleration.
Compare Velocity Changes
Observe how velocity changes over equal time intervals.
Read Slope or Data
Use a velocity-time graph or numerical display to infer acceleration.
Explain Direction
Decide whether acceleration is in the same or opposite direction as velocity.
4. Teacher Notes
Lesson Use
Use this to separate the everyday word acceleration from the physics idea of velocity change. Students should look for change in velocity, not simply high speed.
Discussion Prompts
Ask: Can an object be moving fast with zero acceleration? Can acceleration be negative while the object still moves forward? What does a steeper velocity-time slope mean?
Teaching Moves
Use paired cases: constant velocity versus increasing velocity, then increasing velocity versus decreasing velocity.
5. Concept Check
These questions are generated from the topic and the concept illustrated by the simulation. Use them after students have explored the model.
Concept Score
Correct first attempts build a streak and unlock higher point multipliers on this device.
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Answer each question once to build your streak.
1. What is acceleration?
2. What does a steeper velocity-time slope mean?
3. Can an object move with constant speed and zero acceleration?
4. What can negative acceleration mean?
5. What evidence identifies acceleration?
7. Learning Pulse
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