forces

• Applied force is a force that is applied to an object by a person or another object.
• Dynamics - study of forces and their effects on motion.
• Isaac Newton - first to formulate the fundamental physical laws
• Force refers to a push or pull on an object
• Contact forces refer to two objects physically interact
• NON-CONTACT FORCES - act between bodies that do not require physical contact.
• THE NET FORCE - vector sum of all the forces acting on an object.
• A ZERO NET FORCE - no change in the state of motion of the object or if it is at rest.
• NEWTON’S FIRST LAW OF MOTION (INERTIA) - an inertial frame of reference has zero acceleration, either the object is moving at a constant velocity, or it is standing still (at rest).
• Inertial frame of reference is one that is not undergoing acceleration. It is either at rest or moves with a constant velocity.
• Non-Inertial is a reference frame that is accelerating either in linear fashion or rotating around some axis.
• • The acceleration of an object is dependent upon two variables the net force acting upon the object and the mass of the object.
• • force is directly proportional to acceleration and mass is inversely proportional to acceleration.
• NEWTON’S THIRD LAW OF MOTION (INTERACTION) - It states that for every action, there is always an equal and opposite reaction.
• • action and reaction forces always come in pairs and are equal in magnitude but opposite in direction.
• FRICTION

  is a force that occurs between two surfaces, and it acts to impede motion
• Friction is parallel to the surface and opposite to direction of the object,
• STATIC FRICTION is a force that keeps an object at rest and resists the initiation of motion.
• KINETIC FRICTION

  • is a force that acts between moving surfaces, and it resists the motion of a moving object.
• • Static friction is directly proportional to the horizontal force/applied force
• The applied force must be greater than the frictional resistance for motion to occur
• The coefficient of static friction is always greater than the coefficient of kinetic friction on any given surfaces.