Force and Pressure

• What is the definition of altitude?

  The height of an object above sea level
• How is area commonly measured?

  In square meters (m²)
• What happens to atmospheric pressure with increasing altitude?

  It decreases with increasing altitude
• What is buoyancy?

  The upward force exerted by a fluid
• What does compression refer to in physics?

  Reduction in volume due to applied force
• What is a contact force?

  A force exerted when objects touch
• How is density defined?

  Mass per unit volume of a substance
• What is the unit of force in the SI system?

  Newton (N)
• What is a non-contact force?

  A force acting without physical touch
• What is the normal force?

  Force exerted by a surface supporting weight
• What is the SI unit of pressure?

  Pascal (Pa)
• How is pressure calculated?

  Pressure = Force / Area
• How do you convert cm² to m²?

  Divide by 10,000
• How do you convert mm² to m²?

  Divide by 100,000
• What is the formula for pressure in a fluid?

  Pressure = Height x Density x Gravitational Strength
• What happens to pressure as depth increases in a liquid?

  Pressure increases with increasing depth
• What is upthrust?

  The upward force on a submerged object
• What determines whether an object floats or sinks?

  Comparison of upthrust and object's weight
• What is atmospheric pressure?

  Pressure from the weight of the atmosphere
• Why does atmospheric pressure decrease with altitude?

  Fewer air particles above a surface
• What is the relationship between air density and altitude?

  Air density decreases with increasing altitude
• How does heating a gas affect its pressure?

  Increases kinetic energy and pressure
• What is the formula for calculating pressure in a liquid column?

  Pressure = Height x Density x Gravitational Strength
• What is the symbol for pressure in physics?


  p
• What is the unit for height of the column?

  Meter (m)
• What is the unit for density?

  Kilograms per cubic meter (kg/m³)
• What is the unit for gravitational field strength?

  Newtons per kilogram (N/kg)
• What happens to air molecules as altitude increases?

  They become less dense and further apart
• How does the pressure at a surface relate to the weight of air above it?

  Pressure equals weight of air in column above
• What is the effect of air molecules colliding with a surface?

  They create atmospheric pressure
• What is the significance of the atmosphere's thickness compared to Earth?

  It is a thin layer of air around Earth
• What is the relationship between pressure and area?

  Pressure is force per unit area
• How does the number of air particles affect atmospheric pressure?

  More particles increase pressure, fewer decrease
• What happens to pressure as the number of air particles above a surface decreases?

  Pressure decreases as fewer particles collide
• What is the effect of depth on pressure in a liquid?

  Pressure increases with depth in a liquid
• What is the relationship between upthrust and the weight of an object?

  Upthrust must equal weight to float
• How does the pressure on the bottom surface of a submerged object compare to the top surface?

  Bottom surface has greater pressure than top
• What is the significance of the gravitational field strength in pressure calculations?

  It is a factor in calculating pressure
• How does the atmosphere change with altitude?

  It becomes less dense with increasing altitude
• What is the relationship between the weight of air and atmospheric pressure?

  Weight of air creates atmospheric pressure