Physics-Science

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How sounds travel...
An object makes a sound by vibrating. The vibration pass through the air by making air molecules vibrate. These vibrations are picked up by the air.
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How sound waves move..
Sound waves travel because vibrating particles pass on the vibration from one particle to another.
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How we hear..
We detect sounds because of the vibrations in the air hitting our ear drums and sending electrical waves to your brain so that we can understand what is being said.
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Amplitude and frequency
Amplitude is how high the sound wave is and frequency and pitch are the same thing.
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How we see...
We see because the light reflects the image that we are staring at.
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How light moves..
Light travels in straight lines. Lines travels very fast, around 300 kilometer per second. At this speed we could travel around the world 8 times in a second.
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Emit and transmit
Emit means to give out light and transmit means to pass through.
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Translucent and Transparent
Translucent is a material that allows light to travel but it is scattered so you can't see through but you can see through a transparent material.
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When light hits an object..
When light it can do three things; reflect- light rebounds, absorb- none of the light is reflected or it transmits- passes through.
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Coloured lights
In a white light coloured objects reflects some of the light. The rest is absorbed. Black objects absorb all colors. If you have a red coat on and it appears red, it's because only red light is reflected.
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Parts of the eye
Cornea- focuses light as it passes through. Iris- Behind the eye, colorful part of the eye. Pupil- Opening that lets light into the eye, it's black. Muscles- change the size of the pupil. Lens- Focuses the light tot the back of the eye.
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Parts of the eye 2
Ciliary muscle- Changes the shape of the lens, focuses on objects. retina- Back wall of the eye. Rods cells- see the shape and for of an object. Cone cells- see in colour, sensitive to red blue and green. Optic nerve- Carry electrical messages-brain.
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Convex mirrors and Concave mirrors
Convex mirrors is where the center curves towards the source of the light are called diverging mirrors. Concave mirrors are when the center curves away from the source of light they are called converging mirrors.
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Forces
Forces can; Change the direction, shape or speed of an object. A contact forces happens when you are touching something and a non contacting force acts even though it isn't touching. You measure forces in newtons.
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Types of forces
Thrust, Drag, Magnetism, Air resistance, Weight, Upthrust, Friction, Thrust, Reaction. Resultant force is what we called unbalanced forces.
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Speed, distance and time
Speed=Distance/time. Speed x Time= Distance. Distance/Speed=Time.
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Static Electricity
Protons are positive. Neutrons are neutral. Electrons are negative. A Positive charge attracts a negative charge but repels a positive charge and vice versa for negative charge.
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Types of Energy
Elastic potential, Kenetic, Gravitational potential, chemical, Light, Sound, Nuclear, Thermal.
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Energy
Energy is measure in joules named after James Joules it's symbol is J. 1 Watts= 1Jp/s
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Other cards in this set

Card 2

Front

Sound waves travel because vibrating particles pass on the vibration from one particle to another.

Back

How sound waves move..

Card 3

Front

We detect sounds because of the vibrations in the air hitting our ear drums and sending electrical waves to your brain so that we can understand what is being said.

Back

Preview of the back of card 3

Card 4

Front

Amplitude is how high the sound wave is and frequency and pitch are the same thing.

Back

Preview of the back of card 4

Card 5

Front

We see because the light reflects the image that we are staring at.

Back

Preview of the back of card 5
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