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Types of Force

Types of Force. Ms. Mayner. External & Internal Forces. Two types of forces that act on structures External Internal A Structure is designed so that the external and internal forces that act on it will not cause it to break or fall over. External Force.

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Types of Force

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  1. Types of Force Ms. Mayner

  2. External & Internal Forces • Two types of forces that act on structures • External • Internal • A Structure is designed so that the external and internal forces that act on it will not cause it to break or fall over

  3. External Force • A force of pressure coming from outside the structure • Point of Application affects the force • Location on an object where the force is applied • Plane of Application affects the force • An imaginary flat surface through which the applied force passes

  4. External Force • Non- Contact Forces • Those applied to an object by another object not in contact with it • Example: GRAVITY (always acts downward on Earth)

  5. External Force • Contact Forces • Also called “applied forces” • PUSHING something • PULLING something • THROWING something • Examples: WIND, EARTHQUAKES, WEIGHT OF PEOPLE, WEIGHT OF STRUCTURE

  6. INTERNAL FORCES • Act between different parts of the same structure (inside) • There are four types of internal forces • Tension • Shear • Compression • Torsion

  7. Tension • Definition: A pulling force (especially noticed when pull is resisted or when two pulls are in opposite directions) • Example: • Pulling an elastic band • Something heavy hanging from a string or rope • A plank of wood bending under your weight

  8. Shear • Definition: A force similar to the action of scissors; two forces that act in opposite directions along the same plane inside and object • Examples • Scissors cutting paper • Pliers cutting wire • Licorice being pulled apart

  9. Compression • Definition: a pushing or squeezing force, a force that acts in opposite directions • Examples • Squeezing a ball • Squeezing play doh • Hammering a piece of metal • Using a clamp to squeeze a piece of styrofoam

  10. Torsion • Definition: A twisting force • Examples • Ring out a cloth • Hold out a meter stick and twist in opposite directions • Turn a doll’s head

  11. Today’s Work FORCES External Forces – come from the outside of an object. Ex. Gravity, push, pull Internal Forces – come from inside an object. Ex. Compression, tension, shear, torsion • In your notebook, draw pictures of each type of Internal Force • Read section 10.4 External and Internal Forces • Then answer question #1 and 2 in the package I gave you.

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