Science 106: Weight and Force Quiz
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Questions and Answers

What is the SI unit of pressure?

  • Newton
  • Pascal (correct)
  • Joule
  • Watt
  • When fluids exert pressure on the base and walls of a container, where is this pressure transmitted?

  • In a single direction
  • Only downwards
  • Only upwards
  • Undiminished in all directions (correct)
  • Why does a ship made of iron and steel float in sea water while a sheet of iron and steel would sink?

  • Due to the difference in the amount of iron and steel used
  • Due to the weight distribution in a ship compared to a flat sheet
  • Due to the buoyant force exerted by water (correct)
  • Due to the shape and volume displacement of the ship
  • Which term is used to describe the upward force on an object immersed in a fluid?

    <p>Upthrust or buoyant force</p> Signup and view all the answers

    How does an externally applied force balance the upward force on a bottle immersed in water?

    <p>By acting downwards and being at least equal to the difference between upward force and bottle weight</p> Signup and view all the answers

    Why did Archimedes discover the principle named after him, according to the text?

    <p>He noticed the water in a bathtub overflowed when he stepped into it.</p> Signup and view all the answers

    How did Archimedes determine the purity of the Archimedes gold made for the king?

    <p>By applying Archimedes’ principle.</p> Signup and view all the answers

    Which device used in determining the density of liquids is based on Archimedes’ principle?

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

    In Archimedes’ principle, what force does a body experience when immersed in a fluid?

    <p>Upward force</p> Signup and view all the answers

    How did Archimedes' understanding of mechanics help the Greek army in its war with the Roman army?

    <p>By applying principles of thrust and pressure</p> Signup and view all the answers

    What is the SI unit of pressure?

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

    Why do truck or motorbus tires have much wider contact areas compared to regular car tires?

    <p>To decrease the pressure on the ground</p> Signup and view all the answers

    How does the sharp edge of a cutting tool affect the pressure it exerts?

    <p>Increases pressure due to a smaller contact area</p> Signup and view all the answers

    In which scenario does an object experience higher pressure: when a force is distributed over a larger area or a smaller area?

    <p>Smaller area</p> Signup and view all the answers

    Why does a camel find it easier to run in a desert compared to other terrains?

    <p>Due to higher pressure exerted by its hooves on the sand</p> Signup and view all the answers

    What is the SI unit for pressure?

    <p>Newton per square meter (N/m²)</p> Signup and view all the answers

    If the thrust acting on an object is constant, what factor determines the pressure exerted?

    <p>The area over which the thrust acts</p> Signup and view all the answers

    In the context of fluids, what is the pressure at a given depth proportional to?

    <p>The density of the fluid and the depth</p> Signup and view all the answers

    If a rectangular wooden block with dimensions 20 cm × 10 cm is placed on a table, and the same block is then placed with dimensions 40 cm × 20 cm, which placement will exert more pressure on the table?

    <p>The 20 cm × 10 cm placement, as the thrust is concentrated on a smaller area</p> Signup and view all the answers

    In the example of standing on loose sand versus lying down, what is the primary reason for the different effects observed?

    <p>The difference in the area over which the thrust acts in each case</p> Signup and view all the answers

    What is the SI unit of pressure?

    <p>Pascal (Pa)</p> Signup and view all the answers

    If a force acts on a smaller area, the pressure exerted will be:

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

    Which of the following statements is true regarding the pressure exerted by a solid on a surface?

    <p>It is due to the weight of the solid</p> Signup and view all the answers

    Why do nails have pointed tips, knives have sharp edges, and buildings have wide foundations?

    <p>To distribute the weight evenly over a larger area</p> Signup and view all the answers

    In the context of pressure, what is the difference between solids and fluids?

    <p>Both solids and fluids exert pressure due to their weight</p> Signup and view all the answers

    When a bottle is pushed deeper into water, the upward force exerted by the water ____________.

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

    In the scenario where an iron nail is placed on the surface of water in a beaker, the nail sinks due to ____________.

    <p>upward force exerted by the water</p> Signup and view all the answers

    The fact that an iron nail sinks in water implies that the weight of the nail is ____________.

    <p>greater than the upthrust of water</p> Signup and view all the answers

    When a bottle is released in water, it bounces back to the surface because ____________.

    <p>the upward force exceeds the downward gravitational force</p> Signup and view all the answers

    When a stone is gradually lowered into water, the decrease in the elongation of the string or the reading on the spring balance is due to:

    <p>The upward force exerted by the water on the stone, known as the buoyant force</p> Signup and view all the answers

    The difficulty in pushing a bottle deeper into water indicates an increase in ____________.

    <p>upthrust from water</p> Signup and view all the answers

    The magnitude of the buoyant force experienced by a body immersed in a fluid depends on:

    <p>The volume of the body and the density of the fluid</p> Signup and view all the answers

    The SI unit of pressure is ____________.

    <p>Pascal (Pa)</p> Signup and view all the answers

    If two bodies of the same volume are immersed in the same fluid, the one with a higher density will experience:

    <p>A smaller buoyant force</p> Signup and view all the answers

    What happens to the nail placed on the surface of water when it is pulled down by gravity?

    <p>It gradually sinks until fully immersed.</p> Signup and view all the answers

    If a body is immersed in two different fluids with the same volume, the fluid with a higher density will exert:

    <p>A greater buoyant force on the body</p> Signup and view all the answers

    Why does a bottle float when placed in water?

    <p>Because the upward thrust from water exceeds its weight.</p> Signup and view all the answers

    If a body is subjected to a constant force, the pressure exerted by the body on a surface will be:

    <p>Inversely proportional to the area of the surface</p> Signup and view all the answers

    What effect does the gravitational attraction of Earth have on the iron nail placed on the surface of water?

    <p>Pulls it downwards</p> Signup and view all the answers

    What happens when an object is immersed in water?

    <p>An upward force is exerted on it by water</p> Signup and view all the answers

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