Force

Force

1. Newton

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

2. Net Force

   • The combination of all forces acting on an object
   • Balanced Forces
     • Equal forces acting on one object in opposite directions.
   • Unbalanced Forces
     • Can cause an object to start moving, stop moving, or change direction. 
     • Free Fall
       • When the only force acting on an object is gravity. 

3. Friction

   • The force that two surfaces exert on each other when they rub against each other. 
   • Static Friction
     • The friction that acts on objects that are not moving.
   • Sliding Friction
     • Occurs when two solid surfaces slid over each other.
   • Rolling Friction
     • When an object rolls across a surface. 
   • Fluid Friction
     • When a solid object moves through a fluid. 
     • Air Resistance
       • Objects falling through air experience a type of fluid friction. 
       • Terminal Velocity
         • The greatest velocity of a falling object reaches. 

4. Gravity

   • Is a force that pulls objects toward each other. 
   • Mass
     • Is a measure of the amount of matter in an object. The more mass an object has, the greater its gravitational force. 
     • Weight
       • 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. 
   • Universal Gravity
     • 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. 
   • Factors Affecting Gravity
     • Two factors affect the gravitational attraction between objects: mass and distance. The gravitational force depends on the distance between the objects.  

5. Projectile

   • An object that is thrown. 

6. Inertia

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

7. Momentum

   • Is a characteristic of a moving object that is related to the mass and the velocity of the object. 
   • Law Of Conversation Of Momentum
     • States that in the absence of outside forces, the total momentum of objects that interact does not change. 

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