For information:

• http://www.learner.org/interactives/parkphysics/coaster.html
• http://science.howstuffworks.com/engineering/structural/roller-coaster3.htm
• http://www.physicsclassroom.com/mmedia/energy/ce.cfm
• http://www.teachengineering.org/view_lesson.php?url=collection/duk_/lessons/duk_rollercoaster_music_less/duk_rollercoaster_music_less.xml
• http://www.physicsclassroom.com/class/circles/u6l2b.cfm
• http://physics.gu.se/LISEBERG/KANONEN/brake_pe2012.pdf
• http://www.unc.edu/~ncspence/physics101/Braking%20and%20Friction.htm
• http://www.gforces.net/insight-human-tolerance-vertical-axis.html
  

For pictures:

• http://amusementauthority.blogspot.com/2013/11/ultimate-coaster-design-book-updated.html
• http://www.physicsclassroom.com/class/circles/u6l2b.cfm
• http://sarcasticlittlemiss.wordpress.com/category/uncategorized/page/8/
• http://www.themeparkreview.com/forum/viewtopic.php?t=47110
• http://en.wikipedia.org/wiki/Brake_run
• http://stancik12p6magnets.wikispaces.com/Rollercoasters+and+their+use+of+magnets
• http://www.channel4learning.com/sites/gcsease/science/case_studies_rollercoaster.html
• http://3.bp.blogspot.com/-OiJlhfQCiJI/Tq5M1AKOpgI/AAAAAAAALhA/loB4rhG5skQ/s1600/Millennium+Force+Roller+Coaster1.jpg