Structures and Forces

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Structures and Forces 저자: Mind Map: Structures and Forces

1. Describing forces

1.1. Point of Application

1.1.1. Is a specific location where force is being used on. The side,middle,front,back or underneath. Ex. I'm trying to hit the middle of the dart board Ex. I'm trying to throw a basketball into the middle of the net Ex. I'm trying to aim for the bulls eye(middle) for archery

1.2. Magnitude

1.2.1. Is the speed of the force being applied on a structure, object or human. Fast, medium, slow. Ex. "Hey look at that guy! The magnitude of his soccer ball kick is so fast!" Ex. She slowly walk, and someone says " the magnitude of her leg are slow"

1.3. Plane of Application

1.3.1. The face where the force is being used on, the angle 90 degrees 45 or 180 degrees. Ex. When you are pushing the face of a cupboard, 90 degrees Ex. Pushing a person forward or away from you, 90 degrees Ex . When someone is pushing or pulling the door open or close, 90 degrees

1.4. Direction

1.4.1. Is wether the force being applied is a push or pull. Sraight or curve. Ex. When you do a soccer kick it is a push and a curve kick, straight Ex. When you walk the wind pushes your hair forward when it blows, straight Ex. When you push your bed

2. Types of Structures

2.1. Solid structures

2.1.1. A structure which is most likely to be solid inside and out, but sometimes it can be hollow. Ex. Egyptian pyramids Ex. Mountains Ex. Walls

2.2. Shell Structures

2.2.1. A shell structure is a structure that has room inside of it and is hollow. They can be used to hold things. Ex. Tennis racks Ex. Igloo Ex. Egg shells

2.3. Frame Structures

2.3.1. A frame structure is a structure that are attached to each other to make a structure. Ex. Spider web Ex. Skeleton Ex. Bridges

2.4. Combination Structures

2.4.1. A combination structure is a structure where all types of structures are used to form a strong building. Ex. Car Ex. A mall Ex. A house

3. Types of Loads

3.1. Dynamic Load

3.1.1. The movement during the structures actions. Ex. When wind blows a boats sail Ex. The wind blowing away a hat on a person's head Ex. The water blowing the water affecting the surfer that is surfing

3.2. Live Load

3.2.1. The object or living thing that gets supported by the dead load. Ex. The human sitting on a chair Ex. The person sleeping in a bed Ex. The person driving/ inside a car

3.3. Dead Load

3.3.1. The object or living thing that is supporting the live load. Ex. The car when person is driving in. Ex. The bed when someone is sleeping in. Ex. The chair that the human is sitting on

3.4. Static Load

3.4.1. The structure's results when gravity is applied on the structure. It is a not moving load. Ex. A school Ex. A wall Ex. Roof of a house

4. Types of Forces

4.1. Internal Forces

4.1.1. Torsion Is an internal force which includes the act of twisting on a structure Ex. When you open a door, you turn/twist the door nob, this is also torsion. Ex. When you unlock something using a key, you must turn/twist the key in order to unlock what you need to , this is torsion. Ex. When you want to get the water out of your towel you twist the water out, this is torsion

4.1.2. Tension Is the point in a strcture,object human or animal that balances eveyrthing there is where the force of gravity acts Ex. when you hurt a muscle you always stretch it out, this is tension. Ex. Stretching a rubber band apart from each other Ex. In synchronized skating both ends of the line have to stretch out to create tension so the line is straight.

4.1.3. Compression Is an internal force in which includes The act of squishing on a structure Ex. When you write on a paper using a pencil the lead on the pencil squishes against the paper, this is compression. Ex. When you shape clay , you squish it together, this is compression. Ex. When you go for a walk or a jog, your foot squishes against your shoe and your shoe compresses against the ground.

4.1.4. Shear Is an internal force in which may include the act of bending on a structure and force in opposite directions, which may result in snapping the structure or object Ex. When you open up chopsticks that are stuck together . that is shear. Ex. When you want to cut paper the blades of the scissors rub against each other in opposite directions, this is shear force Ex. When you bend clay to form it into different shapes it is shear.

4.2. External Forces

4.2.1. Friction The action of two sides rubbing against each together Ex. When you scratch your head it causes friction. Ex. When you rub a balloon against you head it causes friction, that is why it can stay on the wall. Ex. When you are cold you rub your hands against each other to keep thou warm, this is friction.

4.2.2. Gravity The action among two items, which is natural Ex. An object falling down like a apple falling from a tree Ex. When you slide down a slide. Ex. When you fall down after you jump up.

4.2.3. Push The action of shoving something forwards by exerting force. Ex. When you have a friend on the swing, you move them forward to move them. You PUSH them. Ex. When you close a cabinet you had opened before you are PUSHING it closed. Ex. When you are in a crowd of people you have to shove your way through, you have to push your own path in order to move.

4.2.4. Pull The action of moving something or someone closer to you or someone else Ex. When you open a cabinet you PULL the cabinet open. Ex.. When you push yourself on a swing you must move yourself backwards, PULL yourself back before pushing yourself forward to create speed. Ex. When you move a sleigh up a hill its easiest to PULL it.

5. Forces are the energy or power of a movement or action

6. Center Of Gravity (C.O.G)

6.1. C.O.G is the point in something that balances. The balancing point of a structure. That is also where force of gravity acts,

6.1.1. Ex. The centre of gravity of a human is generally near the stomach but depending on your physical appearance the C.O.G may vary.

6.1.2. Ex. The center of gravity of a pyramid is the base because most of the pyramids weight is concentrated there.

6.1.3. Ex. The center of gravity of a chair is the middle of the bottom of the chair because that is where most the weight is being concentrated on,

7. Structures are the formation of parts joined together to make something complicated or simple. Forces are the energy or power of a movement or action