1. The Nature of Waves
9.1

2. Wave -
A repeating movement or disturbance that transfers energy through matter or space

3. All waves carry energy without transporting matter from place to place.
Molecules pass energy along to neighbor molecules who pass energy to neighbor
All waves are produced by vibrations
Waves will travel as long as there is energy to carry

4. Not matter
Boat stays in the same place
Waves move energy …

5. Making Waves
Suppose you are holding a rope at one end, and you give it a shake.
You would create a pulse that travels along the rope to the other end, and then the rope would be still again.

6. It is the up-and-down motion of your hand that creates the wave.
Anything that moves up and down or back and forth in a rhythmic way is vibrating.
The vibrating movement of your hand at the end of the rope created the wave. In fact, all waves are produced by something that vibrates.

7. Medium - Matter through which a wave travels.
A medium can be a solid, liquid, gas or combination of these
Not all waves need a medium to travel
Light and radio waves can travel though space

8. Mechanical Waves Waves that can travel only through matter are called.
The two types of mechanical waves are transverse waves and longitudinal waves.

9. Some examples of Mechanical Waves

10. Transverse Waves
Matter moves back and forth at right angles to direction that wave travels

11. Longitudinal Waves
Matter in medium moves in the same direction that wave travels

12. Read Section 1 Explain the motion created by: Water waves Sound waves
Seismic waves

13. Water Waves
The water that is pushed aside returns to its initial position.