Further motion concepts

• What do all moving objects have?

  Momentum
• What is difficult to change if an object has lots of momentum?

  The direction of the object
• What is the equation for momentum?

  Momentum = mass * velocity
• What is momentum measure in?

  kgm/s
• What is mass measured in?

  kg
• What is velocity measured in?

  m/s
• What is newton’s third law?

  If Body A exerts a force on Body B, Body B exerts an equal and opposite force on Body A
• What does momentum also depend on?


  Direction
• How can momentum change?

  • If it slows or speeds
  • If it changes direction
• What is conservation of momentum?

  That if no external forces act upon an object, momentum is conserved
• How do we use conservation of momentum in equations?

  The momentum before the collision equals after the collision so it can be used to calculate mass and velocity
• What is the equation for force?

  Force = change in momentum/time
• Total momentum before = total momentum after
• How do you change the momentum of an object?

  Apply a force to it
• What is the second equation for force, including mass and acceleration?

  Force = mass * acceleration
• What is an example

  of a collision where momentum must be conserved?

  Explosions
• Why might momentum be negative after an explosion?

  The cannon moves backwards to conserve the momentum in the explosion
• What is a cannon moving backwards in an explosion called?

  Recoil
• What are the 5 factors in motion equations?

  VUXAT
• What does V stand for in VUXAT?

  Final velocity
• What does U stand for in VUXAT?

  Initial velocity
• What does X stand for in VUXAT?

  Distance travelled
• What does A stand for in VUXAT?

  Acceleration
• What does T stand for in VUXAT?

  Time taken
• What is a moment?

  A turning force
• What’s an example of a moment?


  Opening a door around a hinge
• What is another name for a turning force?


  Pivot
• What do moments depend on?

  The size of the force and the perpendicular distance to the direction of force
• What is the equation for a moment?


  M= F*d
• What does the M stand for in the moment equation?

  Moment
• What does the F stand for in the moment equation?

  Force
• What does the d stand for in the moment equation?

  Perpendicular distance
• Sum of anticlockwise moment=sum of clockwise moment
• Whats an example of a balanced moment?

  See-saw or cranes