FRICTION

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Across
  1. 2. Tyres have these for increased grip
  2. 3. Reduce friction by converting sliding friction to rolling friction
  3. 5. A consequence of friction
  4. 6. Such shapes reduce friction
  5. 9. Friction present when a shopping trolley is rolled
  6. 10. Friction present when there is no relative motion between the surfaces in contact
Down
  1. 1. Frictional force acting on a person using a parachute
  2. 4. Something that reduces friction
  3. 7. Increasing this property of a surface increases friction
  4. 8. ______ of surface irregularities is the primary cause of friction