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Contact Forces Contact Forces Applied ForceApplied Force Surface ForceSurface Force Friction Force Friction Force Air Resistance Air Resistance
ForceForce Tension ForceTension Force Lift ForceLift Force Thrust ForceThrust Force
Action-at-a-Distance Action-at-a-Distance ForcesForces
Force of GravityForce of Gravity Electrical ForceElectrical Force Magnetic ForceMagnetic Force
Contact Forces Contact Forces Applied ForceApplied Force Surface ForceSurface Force Friction Force Friction Force Air Resistance Air Resistance
ForceForce Tension ForceTension Force Lift ForceLift Force Thrust ForceThrust Force
Action-at-a-Distance Action-at-a-Distance ForcesForces
Force of GravityForce of Gravity Electrical ForceElectrical Force Magnetic ForceMagnetic Force
Types of ForcesTypes of Forces
Name of ForceName of Force SymbolSymbol Description of the force.Description of the force.
Force of GravityForce of Gravity FFg g ←←
FFgravgrav
The force with which the The force with which the earth or other massively earth or other massively large object attracts large object attracts another object towards another object towards itself.itself. Is always directed Is always directed downwards downwards
Applied ForceApplied Force FFappapp A force which is applied A force which is applied to an object by a person to an object by a person or another object.or another object.
Types of ForcesTypes of ForcesName of ForceName of Force SymbolSymbol Description of the force.Description of the force.
Surface Force &Surface Force &
Normal ForceNormal Force
(Normal means (Normal means perpendicular)perpendicular)
FFsurfsurf ←←
FFNorm Norm
FFNN
The support force The support force exerted upon an object exerted upon an object which is in contact with which is in contact with a surface of another a surface of another object.object.
Friction ForceFriction Force FFff ←←
FFfricfric
The force exerted by a The force exerted by a surface as an object surface as an object moves across it or makes moves across it or makes an effort to move across an effort to move across it.it. Directed opposite of Directed opposite of motion.motion.
Types of ForcesTypes of Forces
Name of ForceName of Force SymbolSymbol Description of the force.Description of the force.
Air Resistance Air Resistance ForceForce
FFairair A frictional force which A frictional force which acts upon objects as they acts upon objects as they travel through the air.travel through the air. Directed opposite of Directed opposite of motionmotion..
Tension ForceTension Force FFTT ←←
FFtenten
The force which is The force which is transmitted through a transmitted through a string, rope, cable, or string, rope, cable, or wire (bridge deck) when wire (bridge deck) when it is pulled.it is pulled.
Types of ForcesTypes of Forces
Name of ForceName of Force SymbolSymbol Description of the force.Description of the force.
Lift ForceLift Force FFliftlift A force that directly A force that directly opposes the weight of an opposes the weight of an “aircraft”“aircraft”..
Thrust ForceThrust Force FFthrustthrust The force that moves an The force that moves an “aircraft” though the “aircraft” though the airair..
Free Body DiagramsFree Body Diagrams
Free-body diagrams (F.B.D.):Free-body diagrams (F.B.D.): Diagrams Diagrams that show the relative magnitude and that show the relative magnitude and direction of all forces acting upon an object direction of all forces acting upon an object in a given situation.in a given situation.
Free Body DiagramsFree Body Diagrams The direction of the arrow shows the direction The direction of the arrow shows the direction
that the force is acting. that the force is acting. The size of the arrow in a free-body diagram The size of the arrow in a free-body diagram
reflects the magnitude of the force. reflects the magnitude of the force. Each force is labeled to indicate the type of force. Each force is labeled to indicate the type of force. Represent the object by a box (or drawing) and Represent the object by a box (or drawing) and
draw the force arrows from the center of the box draw the force arrows from the center of the box outward in the direction that the force is acting. outward in the direction that the force is acting.
There can be any number of forcesThere can be any number of forces
Examples of F.B.D.Examples of F.B.D.
Ex 1) Mr. Z. standing on the ground.Ex 1) Mr. Z. standing on the ground. Ex 2) As Mr. Z. is throwing a racquet ball Ex 2) As Mr. Z. is throwing a racquet ball
across the room to the left.across the room to the left. Ex 3) The racquet ball as it moves through Ex 3) The racquet ball as it moves through
the air after Mr. Z. has thrown it.the air after Mr. Z. has thrown it.
HomeworkHomework
Due on Friday 12/5/14Due on Friday 12/5/1433rdrd Law Practice Law Practice with F.B.D. (1 - 4 and 12)with F.B.D. (1 - 4 and 12)Free Body Diagrams PracticeFree Body Diagrams Practice
Free Body DiagramsFree Body Diagrams
““Free Body Diagram Activities” Free Body Diagram Activities”
– – Due tomorrow Thurs. 11/7/13Due tomorrow Thurs. 11/7/13 ““Free Body Diagram Practice” Free Body Diagram Practice”
– – Due Friday 11/8/13Due Friday 11/8/13
Free Body Diagram Activities1) Sliding a book across the table to the right.
A) Before you slide the book.B) Sliding the book as it acceleratesC) Sliding the book with constant velocity.
2) Lightly kicking a tennis ball across the floor to the right.A) As you are kicking the ball.B) As the ball is rolling across the floor after the kick.C) When the ball comes to a complete stop.
3) Throwing a tennis ball straight up into the air.A) As you are throwing the ball in your hand.B) When the ball is going up.C) When the ball is coming down.D) When you catch the ball.
4) Throwing a paper airplane to the right.A) When you are throwing the paper airplane.B) When the paper airplane is in the air.C) As the paper airplane hits the ground.
5) The foot of a person walking to the right then stopping.A) Before the person starts walking.B) As the person is walking.C) As the person stops.