P2

• The conservation of momentum

  The total momentum stays the same during collisions and explosions as long as no other forces are acting on the objects involved
• Newton’s first law

  If the resultant force acting on an object is zero, a stationary object will stay stationary and a moving object will continue moving at the same speed in the same direction
• Newton’s second law

  Force = mass x acceleration
• Newton’s third law 


  Every action has an equal or opposite reaction
• How do you calculate the resultant force when forces are perpendicular to each other?

  Using Pythagoras theorem
• Unit for mass

  Kg
• Unit for energy


  Joules
• Non contact forces

  Magnetic

  Weight

  Electrostatic
• Contact forces


  Friction

  Air resistance

  Water resistance

  Drag

  Lift

  Thrust

  Tension

  Normal force
• 3 things forces can change within an object

  Speed

  Direction

  Shape
• What is Hooke‘s Law

  The extension of a spring is directly proportional to the force applied to it up to the limit of proportionality
• Gravitational field


  The area around an object where any other object will experience a pull force