gcse physics-moments and pressure

• What does "anticlockwise" mean?


  In the opposite direction that the hands of a clock move around a clock face.
• What is atmospheric pressure?


  The pressure at sea level due to the weight of the Earth’s atmosphere.
• What does Boyle’s Law state about the relationship between pressure and volume of a gas?


  For a fixed mass of gas at constant temperature, the pressure is inversely proportional to the volume.
• What does "clockwise" mean?


  In the same direction that the hands of a clock move around a clock face.
• What is cross-sectional area?


  The area of a slice through an object.
• How is density defined?


  Mass divided by volume.
• What is equilibrium in a physical system?


  A situation where the net force or turning force on a system is zero.
• What is a fluid?


  A liquid or a gas.
• What is a force multiplier?


  A system in which the input force is multiplied to produce a larger output force.
• What is a gear?


  A device which transfers torque from one place to another.
• What is a lever?


  A rigid bar that pivots about a point fulcrum and is used to move or lift a load.
• How is mass defined?


  The amount of matter an object contains, measured in kg.
• What is a moment in physics?


  A turning force which is the product of force times perpendicular distance from a pivot.
• What is the SI unit for pressure?

  Pascal.
• What does "perpendicular" mean?


  A right angle or 90 degrees to a surface.
• What is a pivot ?

  A point on which something turns.
• How is pressure defined?


  The force acting per unit area on a surface.
• What is the principle of moments?


  The sum of the clockwise moments is equal to the sum of the anti-clockwise moments for a system in equilibrium.
• What is the resultant force?


  The sum of all the forces.
• What does "suspended" mean?


  To hang something from above.
• What is a tangent?


  A line that touches one point of a curve.
• What is torque?


  A force that causes twisting or turning.
• What is upthrust?


  The upward force on an object submerged in a fluid due to the weight of the fluid that has been displaced by it.
• What is a vector?


  A quantity that has magnitude and direction.
• What is weight?


  The force of gravity acting on an object.