Force

Anotações:

• A push or pull

1. Newton

   Anotações:

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

   Anotações:

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

      Anotações:

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

      Anotações:

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

         Anotações:

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

   Anotações:

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

      Anotações:

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

      Anotações:

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

      Anotações:

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

      Anotações:

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

         Anotações:

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

            Anotações:

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

   Anotações:

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

      Anotações:

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

         Anotações:

         • 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

      Anotações:

      • 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

      Anotações:

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

   Anotações:

   • An object that is thrown. 
6. Inertia

   Anotações:

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

   Anotações:

   • 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

      Anotações:

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