This page last changed on Aug 09, 2007 by cmcintyre.

1) A hockey puck slides along an icy surface. What makes it slow down?

  • It runs out of push
  • It rubs against the ice
  • It runs out of electricity

2) The rougher the surface, ... 

  • the greater the friction
  • the less the friction
  • the same level of friction 

3) Which of the following is an example of trying to increase friction? 

  • Squirting oil into door hinges
  • Spreading grit onto icy roads (Will students know what "grit" is?)
  • Waxing the underneath of skis

4) Which of the following statements is not true?

  • Friction can only slow things down
  • Friction is never useful
  • Friction can stop things from moving

"It runs out of push" in Question 1 is an odd expression.

Posted by cmcintyre at Aug 14, 2007 10:24
Document generated by Confluence on Jan 27, 2014 16:49