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# Loke - Gyro Swing at Liseberg

Loke is a Gyro Swing from Intamin

• Number of seats: 40
• Largest angle 120°
• Distance from the centre of the circle to the axis o rotation: 23.9m
• Maximum speed 100 km/h
• Rotation: Up to 5 turns/minute
• Diameter of the circle 8.10 m
• Distance from the feet to the axis of rotation: 24.6 m

See also the article Pendulum rides, rotation and the Coriolis effect, analysing the forces in Loke.

### Before the visit

• Loke is a giant pendulum. What period do you expect for Loke? (I.e. how long time will it take for Loke to swing from the highest point, over to the other side, and back again?)
• What is the speed as you pass the lowest point? (Use the radius and the angle to estimate the elevation difference.)
• How large is the  centripetal accelerationen  in the lowest point?
• What forces act in the highest point? At the bottom? Draw a free-body diagram and try to draw all forces in the same scale.

### Data collection at Liseberg

• Measure the times when the pendulum passes the lowest point (This is more accurate - why?) Compare to the value you calculated above?
• Does the maximum angle of a swing influence the period? Is the period different in the beginning?Use, e.g., the stop watch of the phone and note the times and approximate angles for the different swings. Alternatively, you can make a video of the ride and use it to analyse the motion
• Possibly, you can use an app for the phone, such as Physics Toolbox Roller Coaster (make sure the phone does not go into hibernation while you ride!)
• ... or take a look at the accelerometer graph on a separate page which also gives hints or answers to some of the questions above.

## Table for note taking

Angle t (s) Δt (s)   T(s)