Force

Annotations:

• A push or pull

1. Newton

   Annotations:

   • The strength of force is measured in the SI unit called newtons. 
2. Net Force

   Annotations:

   • The combination of all forces acting on an object
   1. Balanced Forces

      Annotations:

      • Equal forces acting on one object in opposite directions.
   2. Unbalanced Forces

      Annotations:

      • Can cause an object to start moving, stop moving, or change direction. 
      1. Free Fall

         Annotations:

         • When the only force acting on an object is gravity. 
3. Friction

   Annotations:

   • The force that two surfaces exert on each other when they rub against each other. 
   1. Static Friction

      Annotations:

      • The friction that acts on objects that are not moving.
   2. Sliding Friction

      Annotations:

      • Occurs when two solid surfaces slid over each other.
   3. Rolling Friction

      Annotations:

      • When an object rolls across a surface. 
   4. Fluid Friction

      Annotations:

      • When a solid object moves through a fluid. 
      1. Air Resistance

         Annotations:

         • Objects falling through air experience a type of fluid friction. 
         1. Terminal Velocity

            Annotations:

            • The greatest velocity of a falling object reaches. 
4. Gravity

   Annotations:

   • Is a force that pulls objects toward each other. 
   1. Mass

      Annotations:

      • Is a measure of the amount of matter in an object. The more mass an object has, the greater its gravitational force. 
      1. Weight

         Annotations:

         • The force of gravity on a person or object at the surface of a planet. Weight is a measure of the gravitational force exerted on an object. 
   2. Universal Gravity

      Annotations:

      • States that the force of gravity acts between all objects in the universe. This means that any two objects in the universe, without exception, attract each other. 
   3. Factors Affecting Gravity

      Annotations:

      • Two factors affect the gravitational attraction between objects: mass and distance. The gravitational force depends on the distance between the objects.  
5. Projectile

   Annotations:

   • An object that is thrown. 
6. Inertia

   Annotations:

   • Is the tendency of an object to resist a change in motion. 
7. Momentum

   Annotations:

   • Is a characteristic of a moving object that is related to the mass and the velocity of the object. 
   1. Law Of Conversation Of Momentum

      Annotations:

      • States that in the absence of outside forces, the total momentum of objects that interact does not change.