Momentum

• Momentum 


  Momentum is only for a moving object. Positive momentum= to the right and negative momentum= to the left. The momentum of an object can change if the object decelarates/ accelerates, changes directio or if the mass changes
• Examples of momentum


  If object collide and move in opposite directions= elastic collision. This happens when objects have different velocities. If objects collide and move in the same direction = inelastic collision. This happens when objects have the same mass and velocity.
• Law of conservation of momentum 


  In a closed system, momentum before and after the event is always the same. When 2 objects collide, both objects will react causing one object to speed ip and the other to slow down. Object of equal mass will have an equal acceleration
• Forces and momentum

  When a force acts on an object that is moving, the object will accelerate or decelerate causing a change in momentum. The force is the rate of change of momentum
• Define inertia 


  Inertia is the tendency of an object to continue in its state of rest or in uniform motion uncless acted upon by an external force
• Inertia and motion

  If an object it at rest, it will tend to remain at rest and if an object is moving at constant velocity it will continue to do so.
• Inertial mass 


  The property of an object which describes how difficult it is to change its velocity. It is the ratio between the force applied to it and the acceleration experienced. Inertial mass= force/acceleration
• Describe the relationship between inertial mass and acceleration

  Inertial mass is inversely proportional to acceleration. Larger inertil mass= small acceleration vice versa