3.2 understand the difference between longitudinal and transverse waves and describe experiments to show longitudinal and transverse waves in, for example, ropes, springs and water

Transverse (the uppy-downy ones)
Most waves are transverse (light waves and all waves of the electromagnet spectrum). In transverse waves the vibrations are at 90º to the direction energy is transferred by the wave

Longitudinal (the other ones)
Longitudinal waves include sound (and ultrasound) waves and shock waves (e.s. seismic waves). In longitudinal waves the vibrations are along the same direction as the energy transferred by the waves

If you have any spare time, it would be a great idea to watch this video, it is a little long but very helpful!...

https://youtu.be/jAXx0018QCc