motion

• what is momentum


  the tendency of an object to keep moving in the same direction
• formula for momentum


  P=mv
• word formula for momentum


  momentum=mass x velocity
• what happens to momentum during a collision


  conserved
• newtons second law


  F=ma
• newtons second law word equation

  force=mass x acceleration
• modern cars have a what zone?


  crumple
• why do modern cars have a crumple zone?


  safety feature that reduces the force during impact
• formula linking change in momentum, force, time


  F=Pt
• WORD formula linking change in momentum, force, time 


  force=momentum x time
• what is impulse of a force?


  change in momentum
• crumple zone - momentum


  change in momentum is the same for both cars
• crumple zone - both cars have the same momentum so have the same...


  initial speed and mass
• crumple zone - time taken to stop is longer for new car so...


  rate of change of momentum is less
• crumple zone - force

  force experienced by new car and people inside is less
• crumple zone - whole explanation

  change in momentum is the same for both cars , same initial speed and mass. time taken to stop is longer for new car so rate of change of momentum is less. Force experienced by new car and people inside it is smaller.