Science-physics

• What is the formula for pressure?

  Pressure = Force / Area
• What can pressure cause?

  Pressure can cause pain, cuts, heat, and breaks.
• In which units is pressure measured?

  Pressure is measured in N/m², N/cm², Pa, and Cpas.
• How does an Indian fakir lie on a bed of nails without pain?

  He spreads his weight over a large area, creating low pressure.
• Why do snow shoes work effectively in snow?

  They spread weight over a large area, creating low pressure which prevents sinking.
• What is the pressure if the weight is 400,000 N and the area is 80,000 m²?

  Pressure = $\frac{400,000 \text{ N}}{80,000 \text{ m}^2} =$$5 \text{ N/m}^2$
• How does pressure behave in liquids?

  Pressure in liquids increases with depth due to the weight of the liquid above.
• What causes air pressure?

  Air pressure is caused by molecules hitting a surface.
• How does air pressure change with altitude?

  Air pressure decreases with altitude because there is less air above.
• What effect does atmospheric pressure have?

  Atmospheric pressure produces a buoyant effect.
• What are the Magdeburg Spheres related to?

  They demonstrate the effects of atmospheric pressure.
• What happens to the atmospheric pressure inside the Magdeburg Spheres?

  The atmospheric pressure outside is strong enough to pull them together when the air is removed.
• What is the formula for calculating moments?


  Moment = Force x Distance from pivot
• What is a moment?

  A moment is a turning force that depends on the force and the distance from the pivot.
• Who had a bigger turning force in the experiment described?


  Jai had a bigger turning force as he was further away from the hinge.
• What is a lever?

  A lever is a device that magnifies a force and consists of a rod and a pivot.
• What are the effects of pressure in different contexts?

  • In solids: can cause pain, cuts, heat, and breaks.
  • In liquids: increases with depth due to weight.
  • In gases: varies with the number of particles and their movement.
• What are the key concepts related to pressure and moments?

  • Pressure: defined as Force/Area, measured in N/m², N/cm², Pa, Cpas.
  • Moments: defined as Force x Distance from pivot, measured in newton meters (nm).