Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How can we cause friction?
   • Rubbing causes friction between surfaces.
2. What does the amount of friction depend on?
   • The amount of friction depends on the roughness of the surfaces.
3. In what direction does friction always act in relation to motion?
   • Friction always acts to resist motion and therefore acts in the opposite direction to the (potential) motion.