Forces and Pressure in Fluids Quiz
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Questions and Answers

What is pressure?

  • A measure of the weight of an object
  • A force pulling on a surface
  • A substance that can easily flow
  • A force pushing on a surface (correct)

    • What are some examples of pressure?

  • Holding an object in hand
  • Leaning against a wall (correct)
  • Sitting on a chair
  • Walking on the ground

    • Why does the woman wearing snow shoes stay on top of the snow while the two girls sink into the snow?

  • The woman's weight is less than the two girls
  • The snow is less dense where the woman is standing
  • The woman's snow shoes have a larger area distributing her weight (correct)
  • The woman is exerting less force on the snow

    • What is the unit for pressure?

    <p>Pascal</p> Signup and view all the answers

    In fluids, how do molecules exert pressure against the surfaces they touch?

    <p>By colliding with each other and any surface they meet</p> Signup and view all the answers

    How is pressure calculated?

    <p>$Force/Area$</p> Signup and view all the answers

    What is fluid pressure?

    <p>The total force exerted by the fluid divided over the area over which the force is exerted</p> Signup and view all the answers

    What is the average air pressure at sea level?

    <p>10.13 N/cm2</p> Signup and view all the answers

    Why doesn't the pressure of the air around you crush you?

    <p>Because the pressure inside your body balances the pressure outside of your body</p> Signup and view all the answers

    What happens when you drive up the side of a mountain and your ears 'pop'?

    <p>Air pressure decreases as elevation increases</p> Signup and view all the answers

    Why does water pressure increase as depth increases?

    <p>Because there is more water above you and air in the atmosphere is pushing down on the water</p> Signup and view all the answers

    What are some parts of your body that contain air?

    <p>Lungs, sinus cavities, and inner ear</p> Signup and view all the answers

    Why does air exert pressure?

    <p>Because it has mass</p> Signup and view all the answers

    What is the force that produces average air pressure at sea level?

    <p>Force of gravity on the mass of air</p> Signup and view all the answers

    What causes your ears to 'pop' when you swim down to the bottom of a deep pool or lake?

    <p>Increase in water pressure as depth increases</p> Signup and view all the answers

    What balances the pressure of the air outside your body?

    <p>Air pressure inside your body</p> Signup and view all the answers

    What is the speed of light in space?

    <p>300,000km/s</p> Signup and view all the answers

    What size range do light waves fall into?

    <p>400nm to 700nm in length</p> Signup and view all the answers

    What is the classification of objects that do not allow light to pass through?

    <p>Opaque</p> Signup and view all the answers

    What classification allows some light to go through, but not clearly?

    <p>Translucent</p> Signup and view all the answers

    What term is used for white light made up of all the colors of the rainbow?

    <p>White spectrum</p> Signup and view all the answers

    What happens when light strikes an object and it bounces off, mainly as heat?

    <p>Reflected</p> Signup and view all the answers

    What causes an object to appear a certain color?

    <p>The object reflects light of that color and absorbs all others</p> Signup and view all the answers

    Which color does a black object reflect?

    <p>Black</p> Signup and view all the answers

    What does a white object do to light?

    <p>Reflects all light and absorbs none</p> Signup and view all the answers

    How does the subtractive color system create color?

    <p>By absorbing specific wavelengths of light and reflecting others</p> Signup and view all the answers

    What is the primary purpose of lenses?

    <p>To refract light</p> Signup and view all the answers

    What is the additive color system based on?

    <p>Emitting light directly from a source</p> Signup and view all the answers

    What is the purpose of a polarizing filter?

    <p>To only let specific orientations of light pass through</p> Signup and view all the answers

    What type of reflection occurs when an object surface is smooth and you see an image?

    <p>'Regular' reflection</p> Signup and view all the answers

    What happens to light as it goes from space to air, and then to water or glass?

    <p>It slows down in air and slows down even more in water or glass</p> Signup and view all the answers

    Which combination of primary colors of light produces white light?

    <p>Red + Green + Blue</p> Signup and view all the answers

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