Feb17

READING RESPONSE: REVISE, EDIT & RESUBMIT EVERYONE

I can relate to Bud’s rule about creating and remembering a simple lie to get out of a sticky situation. 

I recall a time when… 

I think this is a fundamental life skill… 

Bud cleverly devised this rule when…

I can relate to Bud’s rule about ensuring adults don’t use something you value as leverage against you.

I recall a time when… 

I think this is a fundamental life skill… 

Bud cleverly devised this rule when…

I can relate to Bud’s rule about deciding promptly to do something and not over-thinking it.

I recall a time when… 

I think this is a fundamental life skill… 

Bud cleverly devised this rule when…

due tomorrow

Science: Forces acting on Structures

-Gravity is the force of attraction between all objects.

-When I lift any heavy object, gravity always pulls it downward to the ground.

-Gravity pulls any object to the ground without touching it and is therefore a non-contact force, for example, the pull between magnets.

-An applied force is the push/pull of objects contacting each other, for example, the contact between a swinging racquet and moving tennis ball.

-Mass is the amount of matter in any object measured in grams, kilograms, pounds etc.

-Weight is the force of gravity acting downward on any object measured in Newtons.

-Dynamic loads are not caused by gravity, for example, a strong wind that pushes on a tree or rushing water that floods a street.

-Live loads like cars and trucks carrying people/cargo is a force acting on a bridge.

-The weight of the bridge structure itself (steel, concrete) is a dead load acting on the bridge.

-a leaf falling from tree: non-contact

-kick soccer ball: applied

-hammer nail: applied

-magnets: non-contact

-waves vs swimmer: applied

-snow on roof/ice on tree:  static “live” load which can cause damage

-empty swings: static “dead” load

-car into fence: dynamic

-wind vs sailboat: dynamic

-dictionary on desk: static “live” load

-bricks of house: dead load – forms structure itself

-diver on board: live load 

Science Task: Forces acting on Structures

Independent or 2 Partners

Select a structure such as a highway bridge, suspension walking bridge, swing set, playscape structure, bouncy castle, staircase, car suspension, roof etc. 

On the diagram of the structure identify with arrows and text an example of a dead load, a live load and a dynamic load.  Explain how each force acts on the structure.

See example pg.273 textbook