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Types of Forces Force – An interaction between two objects resulting in a push or a pull Types of Forces Example 1 Consider the water bottle below at rest on a table. System Schema – a visual representation of the objects that are interacting and the types of interactions (Forces) that are occurring. Force of GravtityFg = A long range force exerted by the Earth on an object Water Bottle Fg Earth Types of Forces Example 1 Consider the water bottle below at rest on a table. Normal Force FN = A support force that always acts perpendicular (Normal) to the surface FN FN Table Fg Water Bottle Fg Earth Floor Types of Forces Example 1 Consider the water bottle below at rest on a table. The water bottle has two interactions leading to two forces acting upon it. FN Table Water Bottle Fg Earth Types of Forces Example 2 Consider the water bottle below pulled horizontally across the floor at constant velocity. Types of Forces Example 2 Consider the water bottle below pulled horizontally across the floor at constant velocity. FN Floor Ff Water Bottle Fg Earth Force of Friction F Force that opposes the motion or attempted motion of f one surface over another. Always acts parallel to the surfaces involved. Types of Forces Example 2 Consider the water bottle below pulled horizontally across the floor at constant velocity. FN Floor F ffk Water Bottle Fg Types of friction: Earth Force of Kinetic Friction F fk = force of friction due to surfaces in relative motion Force of Static Friction F fs = force of friction that opposes attempted motion of the surfaces Types of Forces Example 2 Consider the water bottle below pulled horizontally across the floor at constant velocity. FN Floor F fk Water Bottle Applied Force FA = the force which is applied to an object by a person or another object. FA Fg Me Earth Types of Forces Example 2 Consider the water bottle below pulled horizontally across the floor at constant velocity. FN Floor F fk Water Bottle The water bottle has four interactions leading to four forces acting upon it. FA Fg Me Earth Types of Forces Example 2a What would change about the system schema if the bottle was pulled across the floor at constant velocity by a rope? Types of Forces Example 2a What would change about the system schema if the bottle was pulled across the floor at constant velocity by a rope? FN Floor F fk Water Bottle Force of Tension FT = force which is transmitted through a string, rope, wire or cable when it is pulled tight by forces acting from each end. FT Fg Rope Earth Types of Forces Example 2a What would change about the system schema if the bottle was pulled across the floor at constant velocity by a rope? FN Floor F fk Water Bottle The water bottle has four interactions leading to four forces acting upon it. FT Fg I interact with the rope, not the water bottle. Me FA Rope Earth Types of Forces Example 2a What would change about the system schema if the bottle was pulled across the floor at constant velocity by a rope? FN Floor F fk Water Bottle The water bottle has four interactions leading to four forces acting upon it. FT Fg Rope Earth
