Forces and Types
What is a force (2)
a push or pull
Name one internal force (HINT sponge)
compression, tension, shear, torsion
What is a static load?
a force that does not move
Name one type of bridge
Beam, arch, truss, suspension
Name one natural disasters
Earthquake, avalanche, hurricane
What is the difference between internal and external forces
internal acts inside an object, external acts outside an opject
What is tension?
Pulling/ stretching force
What is a dynamic load?
a moving/ changing force
Which bridge uses cables to hold it up?
Suspension bridge
Why do helmets protect your head
they absorb force
Is wind an internal or external force? Explain
External - it acts ON an object
What is torsion
Twisting force
a person standing on a bridge is what type of load?
Static
Arch Bridge
What forces act on a mountain to cause an avalanche? (2)
Gravity, wind, snow
What type of force is acting when you squeeze an object
compression
A rope holding a swing is being pulled tight. What force is this?
Tension
Cars driving across a bridge are what type of load?
Dynamic
Why are truss bridges so strong?
How are buildings designed to reduce earthquake damage?
Flexible materials, using concrete slip layer every 50cm, this ensures the house would not completely fall
can an object experience more than one type of force at the same time?
yes, multiple forces can act at once
Why do structures need to handle different internal forces?
Different forces can act at the same time
Why are dynamic loads often more dangerous than static loads?
They can change and add extra stress that might be unknown
Which bridge would be best for a long span and why?
Suspension bridges help handle long distances
why must engineers consider forces when designing buildings for disasters?
to prevent damages and keep people safe