The teaching of kinematics is an essential part of any Physics curriculum. The Dynamics System ensures very accurate, repeatable results. Dynamics System - http://www.data-harvest.co.uk/catalogue/science/secondary/dynamics/secondary-dynamics/3800 Extension Kit - http://www.data-harvest.co.uk/catalogue/science/secondary/dynamics/secondary-dynamics/3801 Spoked Pulley - http://www.data-harvest.co.uk/catalogue/science/secondary/dynamics/secondary-dynamics/3177 Interrupt Card Set - http://www.data-harvest.co.uk/catalogue/science/secondary/dynamics/secondary-dynamics/3803 Light Gate - http://www.data-harvest.co.uk/catalogue/science/secondary/smartq-sensors/smartqsensors/3250 Rotary Motion Sensor - http://www.data-harvest.co.uk/catalogue/science/secondary/smartq-sensors/smartqsensors/3280 Motion Sensor - http://www.data-harvest.co.uk/catalogue/science/secondary/smartq-sensors/smartqsensors/3270