Roller Coaster Simulator
Explore Roller Coaster Simulator as an interactive EJS simulation for mechanics.
.png)
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
What Students Can Learn
- Distinguish static friction from kinetic friction.
- Compare applied force, limiting friction, and resultant force.
- Use force arrows or graphs to decide whether the object stays at rest or accelerates.
- Connect normal reaction and coefficient of friction to maximum frictional force.
Guiding Question
At what point does the object change from staying at rest to slipping, and what force evidence shows that transition?
3. Try the Investigation
Predict the Threshold
Before changing the applied force, predict whether the block will stay at rest or slide.
Increase Force Slowly
Raise the applied force in small steps and watch how friction responds before motion begins.
Compare Static and Kinetic Cases
Once sliding begins, compare the friction value and acceleration with the just-before-slipping case.
Explain with Resultant Force
Use the difference between applied force and friction to explain the observed motion.
4. Teacher Notes
Lesson Use
Use this as a threshold lesson: students should see static friction as adjustable, not as a fixed force.
Discussion Prompts
Ask: Why can friction increase while the block remains stationary? What changes when the block starts moving? How does resultant force explain the velocity graph?
Teaching Moves
Have students mark three moments: below limiting friction, at the threshold, and after sliding. Require a free-body diagram for each.
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.
1. What happens to static friction as a small applied force is increased but the block remains at rest?
2. When does the block begin to slip?
3. Once the block is sliding, which friction model usually applies?
4. Which quantity best explains whether the sliding block accelerates?
5. Why is a free-body diagram useful here?
Expert Challenge
Unlocks after 3 correct concept-check answers on this page.
1. In a bungee, basketball, or roller-coaster energy model, what is the best expert evidence for energy transfer?
2. At the lowest point of an ideal roller-coaster track, what should students usually check?
3. In a bungee model, why can speed be zero at a low turning point while force is not zero?
4. What is the expert critique of 'energy is lost because the ball does not reach the same height'?
5. When comparing two launches or drops, what should the student change first?
7. Learning Pulse
Anonymous activity shows this resource is being discovered, revisited, and used by learners in different places.
Where Recent Learners Are From
Country or region is inferred anonymously from server location headers when available. No names, accounts, or IP addresses are shown.