P2 forces and motion

• What is the equation linking mass, velocity, and momentum?

  Momentum = Mass x Velocity
• What does conservation of momentum mean?

  Total momentum before equals total after collision
• What is the equation linking force, change in momentum, and time?

  Force = Change in Momentum / Time Taken

  
• How do safety features reduce injury risk in accidents?

  • Increase stopping time during collisions
  • Apply force over a longer period
  • Decrease force applied on the driver
• What does Newton's third law state about forces?

  For every action, there is an equal opposite reaction
• What is the centre of gravity of an object?

  Point where all weight acts
• How does the centre of gravity affect stability?

  Lower centre of gravity increases stability
• What is meant by "moment" in physics?

  Turning effect of a force
• When does a moment occur?

  When a force is applied away from the pivot
• Is moment a scalar or vector quantity?

  Moment is a vector quantity
• How do you calculate the moment of a force?

  Moment = Force x Perpendicular distance from pivot
• What are the conditions for an object to be in equilibrium?

  Forces must be balanced and moments equal
• Will an object rotate if clockwise and anticlockwise moments are equal?

  No, it remains in equilibrium