Classroom mode
Run it in class
Why do your shoes grip the floor but slip on ice?
Show of hands — before you project anything
Compare the shared ramp demand with each covered sample before choosing an option.
- A Way more than you'd guess
- B About what you'd guess
- C Way less than you'd guess
Count the votes out loud. Hold them to it — then watch.
Project it (fullscreen)
Discussion prompts
- Compare the shared ramp demand with each covered sample before choosing an option.
- Explain why the gate is a new application even though the threshold rule was practiced earlier.
- List conditions that could change a contact pair without changing the visible ramp angle.
Where it shows up in real life
- A boot on a frozen patch versus the same boot on a dry walkway
- A car tire braking on dry, wet, or icy pavement
- A skate designed to glide while a climbing shoe is designed to grip
A prediction-first worksheet — no answer key.
zero prep · no login · any projector
Winding down at home? Family mode ·
Explore every question
Why do your shoes grip the floor but slip on ice?
Predict — what do you think will happen, and why?
Talk about it
- Compare the shared ramp demand with each covered sample before choosing an option.
- Explain why the gate is a new application even though the threshold rule was practiced earlier.
- List conditions that could change a contact pair without changing the visible ramp angle.