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Force Diagram Notes PURPOSE: Used as tools that we can use to predict the motion of objects They show the major forces that influence the motion of an object HOW TO MAKE THEM Force diagrams have 3 parts: 1. OBJECT: Represented with a Circle or a square 2. ARROWS: Arrows show the direction and size of a force acting on the object. They come OUT of the object, always, even if they are a push -Longer arrows= larger forces -Hash Marks show arrows of equal size (magnitude) 3. LABELS: You will label the force arrows with their type, origin of the force, and receiving object. Label numbers if available. example: The force of gravity on your body would be labeled Fweight, human= 1000 N TYPES OF FORCES Weight Applied Force Friction Drag Normal Force Tension The force exerted on an object due to its mass and a gravitational field Any push or pull on an object from an animated source The force created when two solid surfaces make contact and move opposite directions of one another. Friction always opposes motion. The force of friction caused by a liquid or gas contacting a solid object. A force applied by a stationary surface to another object pushing on it. The Normal force is always 90° to the surface, and matches the applied force on it (Example: ground applies a normal force when we stand on it, or a wall when we push on it) Force of pulling applied to ropes, strings, springs, ect. RULES FOR INTERPRETATION 1. If forces act on an object in the same direction, they are added together 2. If they act in opposite directions, they are subtracted 3. If forces are balanced, the object moves at a constant velocity 4. If the Forces are unbalanced, the object accelerates in the direction of the overall force. PRACTICE PROBLEM: 1. Create a force diagram for a cart that is being pushed by a man to the right with 100 N of force, friction of 10 N, and a weight of 50 N. FNormal, groundcart= 50 N Ffriction, groundcart= 10 N Fapplied, pushcart= 10 N Fweight, earthcart= 50 N Force Diagram Notes PURPOSE: Used as tools that we can use to _________________________ the ____________________ of ___________________. They show the major forces that influence the motion of an object HOW TO MAKE THEM Force diagrams have 3 parts: 1. ________________________: Represented with a Circle or a square 2. ______________________: show the ________________ and size of a ___________ acting on the object. They come OUT of the object, always, even if they are a push -Longer arrows= ____________________ forces -Hash Marks show arrows of ____________________ size (magnitude) 3. _____________: You will label the force arrows with their ________, ________ of the force, and _______________ ______________. Label numbers if available. example: The force of gravity on your body would be labeled Fweight, human= 1000 N TYPES OF FORCES The __________________ ___________________ on an object due to its mass and gravitational field (felt as a pull) Any ______________ or __________________ on an object from an animated source The force created when two solid surfaces ___________ ____________________ and move ________________ directions of one another. Friction always opposes motion. The force of friction caused by a liquid or gas contacting a solid object. A force applied by a stationary surface to another object pushing on it. The Normal force is always 90° to the surface, and matches the applied force on it (Example: ground applies a normal force when we stand on it, or a wall when we push on it) Force of pulling applied to ropes, strings, springs, ect. RULES FOR INTERPRETATION 1. If forces act on an object in the _____________ direction, they are __________________ together 2. If they act in ________________ directions, they are ____________________ 3. If forces are _______________, the object moves at a _____________ ______________________. 4. If the Forces are ______________________, the object _____________________ in the direction of the ______________________ force. PRACTICE PROBLEM: 1. Create a force diagram for a cart that is being pushed by a man to the right with 100 N of force, friction of 10 N, and a weight of 50 N.