Free Body Diagrams and Types of Forces

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Presentation transcript:

Free Body Diagrams and Types of Forces

Types of Forces Contact Forces – These result from physical contact between two objects. Field Forces – These act a distance. Does not involve physical contact.

Examples of Forces Field Forces: Contact Forces: Gravitational Force Electrical Force Magnetic Force Contact Forces: Frictional Force Tension Force Normal Force Air Resistance Force Applied Force Spring Force

Fg = W = mg Examples Of Forces Applied Force (F) A Push or Pull on an object Gravitational Force (Fg or W) The gravitational pull by the earth. Also called weight. Its direction is toward the earth. Fg = W = mg Tension (FT) Pulling force by a string or cable

More Examples of Forces Normal Force (FN) The support force exerted upon an object that is in contact with another stable object. Its direction is perpendicular to the contact surface. Friction Force (Ff) Resistance to motion between two objects in contact. Its direction is opposite to the motion of the object. Air Resistance Force (Fair) A type of frictional force that resists motion through the air.

Free body Diagrams A free body diagram shows: the object the force vectors exerted on the object (not by the object) Used to determine the net force on an object

6000 N 4000 N In the free body diagram the weight (force of gravity) is pulling the balloon downward and it is 4000N.

Why do all objects with negligible air resistance accelerate toward the Earth at the same rate? A = F/m = 10000N 1000kg =10m/s/s A = f/m = 10N/1kg =10m/s/s

How can Free Body Diagrams be used to explain how air resistance affects the acceleration of an object in free fall?

Free-body diagrams for three situations are shown below Free-body diagrams for three situations are shown below. Note that the magnitude of the individual forces are indicated on the diagram

Normal Force is perpendicular to the surface, not always straight up