pressure

• what is pressure?


  the force per unit of area
• how does a container of gas create pressure?

  the collisions of the gas particles hitting the wall because each collision applies a force to the inside area of the container
• how does a beaker of water create pressure?

  the water applies forces outwards in all directions as the water particles collide with the glass wall on the sides and bottom and the air collides with the surface
• what is fluid pressure?

  pressure in gases and liquids
• what is the perpendicular force?

  the component of the force which is at right angles to the surface its colliding with
• how does perpendicular force affect the amount of pressure?

  particles hitting the wall at a perfect right angle will produce more pressure due to hitting the wall with a greater force. particles hitting the wall at an angle will produce less pressure because only a certain part of the particles force hits the wall while another part of the force gets deflected away
• What primarily causes pressure on an object submerged in water?

  Surrounding water molecules colliding with it
• What is the role of the weight of water above an object in a jug?

  It contributes a small part to the pressure
• How does pressure change as an object moves deeper in water?

  Pressure increases due to more water above
• How does the density of a liquid affect the pressure experienced by an object?

  Higher density increases mass and weight
• What factors affect liquid pressure on an object submerged in water?

  • Surrounding water molecule collisions
  • Weight of water above the object
  • Density of the liquid
• how does gravitational field strength affect the pressure of water?

  because it determines the weight for a given mass, the bigger the gravitational field strength, the larger the weight
• what is upthrust?


  resultant force upwards
• why do some object sink in water and some objects float?

  if the weight of the object is larger than the upthrust the object will sink. if the upthrust is larger the object will throat?
• how does upthrust work?

  the tiny water molecules exert forces on the box in all direction. since the bottom of the box is deeper in the water than the top of the box, the bottom of the box will experience a larger upwards force from the bottom than it will a downwards for from the top. this means overall the box will be pushed upwards