32 Questions
What is pressure?
A force pushing on a surface
What are some examples of pressure?
Leaning against a wall
Why does the woman wearing snow shoes stay on top of the snow while the two girls sink into the snow?
The woman's snow shoes have a larger area distributing her weight
What is the unit for pressure?
Pascal
In fluids, how do molecules exert pressure against the surfaces they touch?
By colliding with each other and any surface they meet
How is pressure calculated?
$Force/Area$
What is fluid pressure?
The total force exerted by the fluid divided over the area over which the force is exerted
What is the average air pressure at sea level?
10.13 N/cm2
Why doesn't the pressure of the air around you crush you?
Because the pressure inside your body balances the pressure outside of your body
What happens when you drive up the side of a mountain and your ears 'pop'?
Air pressure decreases as elevation increases
Why does water pressure increase as depth increases?
Because there is more water above you and air in the atmosphere is pushing down on the water
What are some parts of your body that contain air?
Lungs, sinus cavities, and inner ear
Why does air exert pressure?
Because it has mass
What is the force that produces average air pressure at sea level?
Force of gravity on the mass of air
What causes your ears to 'pop' when you swim down to the bottom of a deep pool or lake?
Increase in water pressure as depth increases
What balances the pressure of the air outside your body?
Air pressure inside your body
What is the speed of light in space?
300,000km/s
What size range do light waves fall into?
400nm to 700nm in length
What is the classification of objects that do not allow light to pass through?
Opaque
What classification allows some light to go through, but not clearly?
Translucent
What term is used for white light made up of all the colors of the rainbow?
White spectrum
What happens when light strikes an object and it bounces off, mainly as heat?
Reflected
What causes an object to appear a certain color?
The object reflects light of that color and absorbs all others
Which color does a black object reflect?
Black
What does a white object do to light?
Reflects all light and absorbs none
How does the subtractive color system create color?
By absorbing specific wavelengths of light and reflecting others
What is the primary purpose of lenses?
To refract light
What is the additive color system based on?
Emitting light directly from a source
What is the purpose of a polarizing filter?
To only let specific orientations of light pass through
What type of reflection occurs when an object surface is smooth and you see an image?
'Regular' reflection
What happens to light as it goes from space to air, and then to water or glass?
It slows down in air and slows down even more in water or glass
Which combination of primary colors of light produces white light?
Red + Green + Blue
Test your understanding of forces and pressure in fluids with this quiz. Explore the concept of pressure, examples of pressure, and scenarios involving different forces and pressures.
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