Energy Review Matter is anything that has mass and takes up space Matter can be changed physically or chemically Atoms are the smallest particle of an.

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Presentation transcript:

Energy Review Matter is anything that has mass and takes up space Matter can be changed physically or chemically Atoms are the smallest particle of an element that has the chemical properties of that element

Energy Review Energy is the ability to cause change

Energy Review Energy can come in many forms such as, mechanical, sound, chemical, thermal (heat), electromagnetic and nuclear These forms can be broken down into two general types of energy, potential or kinetic

Energy Review Potential energy is the stored energy that an object has due to its position or chemical position Kinetic energy is energy in motion

WAVES TRANSFER ENERGY A wave is a disturbance that transfers energy from one place to another

WAVES TRANSFER ENERGY Waves can transfer energy over a distance without moving matter the entire distance

WAVES TRANSFER ENERGY An ocean wave can travel many kilometers without the water itself moving many kilometers-the water moves up and down- this motion is known as a disturbance It is the disturbance that travels in a wave, transferring energy

Forces and Waves A force is required to change the motion of an object. Forces can start a disturbance as well, sending a wave through a material.

Forces and Waves  Turn to page C10. Draw and label the different examples of forces creating disturbances that are found below

Forces and Waves Example 1 Rope Wave- Think of a rope tied to a door knob. You apply one force to a rope by flicking it upward and an opposite force when you snap it back down. This sends a wave through the rope. Both forces-the one that moves the rope up and the one that moves the rope down-are required to start a wave.

Forces and Waves Example 2 Water Wave- Forces are also required to start a wave in water. Think of a calm pool of water. What happens if you apply a force to the water by dipping your finger into it? The water rushes back after you remove your finger. The force of your finger and the force of the water rushing back send waves across the pool.

Forces and Waves Example 3 Earthquake waves- An earthquake is a sudden release of energy that is built up in a rock as a result of the surrounding rock pushing and pulling on it. When these two forces cause the rock to suddenly break away and move, the energy is transferred as a wave through the ground.

Materials and Waves A medium is any substance that a wave moves through Water is the medium for an ocean wave The ground is a medium for an earthquake wave The rope is the medium for the rope wave

Materials and Waves Waves that transfer energy through matter are known as mechanical waves All the waves we have learned about so far, even sound waves which we will learn about later, are mechanical waves Some waves can transfer energy through empty space. Light is an example of this type of wave

Materials and Waves How are mechanical waves similar?

Energy and Waves Energy can be transferred through matter (causing disturbances)

Energy and Waves The waves caused by earthquake are good examples of this energy transfer. The disturbed ground shakes from side to side and up and down as the waves move through it. The ground does not travel as far from where it began; it is the energy that travels in wave. Kinetic energy is transferred.

WAVES CAN BE CLASSIFIED BY HOW THEY MOVE TRANSVERSE WAVES- the direction in which the wave travels is PERPENDICULAR, or at right angles to the direction of the disturbance. Transverse means “across” or “crosswise.”

WAVES CAN BE CLASSIFIED BY HOW THEY MOVE Think of when you snap that rope (tied to a chair) with your hand. The action causes an up-and-down, or vertical, disturbance. However, the wave it sets off is horizontal, or forward

WAVES CAN BE CLASSIFIED BY HOW THEY MOVE Illustrate (and label) this happening

WAVES CAN BE CLASSIFIED BY HOW THEY MOVE Water waves are transverse waves. The up and down motion of the waves is the DISTURBANCE. The wave travel in a direction that is PERPENDICULAR to the direction of the disturbance.

WAVES CAN BE CLASSIFIED BY HOW THEY MOVE LONGITUDINAL WAVES- the wave travels in the SAME DIRECTION as the disturbance. The coils of a spring show examples of longitudinal waves. In the space provided, draw a picture of this on your note sheet. Sound waves are longitudinal waves