liquid

• What are we calculating in this video?

  Pressure in a liquid and floating objects
• What primarily causes pressure on an object submerged in water?

  Surrounding water molecules colliding with it
• What happens to pressure as an object moves deeper in water?

  Pressure increases due to more water above
• What determines the pressure in a liquid?

  Density of the liquid and gravitational field strength
• What is the equation for pressure in a liquid?

  Pressure = height × density × gravitational strength
• If the height of the liquid column is 10 meters, density is 1,000 kg/m³, and gravitational strength is 9.8 m/s², what is the pressure?

  $98000 \text{ pascals}$
• How do you calculate the change in pressure when diving from 20 meters to 90 meters?

  Calculate pressure at both depths and find the difference
• What is the pressure at a depth of 20 meters in water?

  $196000 \text{ pascals}$
• What is the pressure at a depth of 90 meters in water?

  $882000 \text{ pascals}$
• What is the change in pressure when diving from 20 meters to 90 meters?

  $686000 \text{ pascals}$
• What is up thrust in relation to submerged objects?

  Resultant upward force due to pressure differences
• Why does a submerged box experience a larger upward force at the bottom?

  It is deeper than the top, causing pressure difference
• What determines whether an object floats or sinks?

  Comparison of up thrust and object's weight
• What happens if an object's weight is greater than the up thrust?

  The object sinks
• What happens if an object's up thrust is greater than its weight?

  The object floats
• How can we determine if an object will float without calculating up thrust and weight?

  By comparing densities of the object and liquid
• What happens to a rock in water based on its density?

  A rock sinks because it is denser
• What happens to an apple in water based on its density?

  An apple floats because it is less dense
• What factors determine the pressure in a liquid?

  • Depth of the liquid
  • Density of the liquid
  • Gravitational field strength
• What are the conditions for an object to float or sink?

  • If up thrust > weight, it floats
  • If weight > up thrust, it sinks
• How do you calculate pressure change when diving?

  1. Calculate pressure at initial depth
  2. Calculate pressure at final depth
  3. Find the difference between the two pressures