💥External Forces
Does an external force act from inside or outside a structure?
Outside
Which internal force squeezes or presses together?
compression
What natural disaster happens when the ground shakes or suddenly moves?
Earthquake
What is the main job of protective equipment?
To help protect people from the impact of forces
What is a force?
A push or a pull
Name ONE example of an external force.
Gravity, wind, water, movement of Earth, people pushing/walking, etc.
Which internal force stretches or pulls apart?
tension
What is an avalanche?
A large amount of snow moving quickly down a slope
Name ONE piece of protective equipment.
Helmet, knee pads, goggles, steel-toed boots, etc.
Name ONE thing a force can change about an object.
Speed, direction, shape, or movement
What does magnitude mean?
The size/strength of a force
Which internal force involves twisting?
torsion
What two major forces from a hurricane can damage structures?
strong wind and rain
Why might a house in a flood area be built on stilts?
So floodwater can flow underneath instead of washing the house away
What is the difference between a contact force and a non-contact force?
Contact forces involve touching; non-contact forces do not.
What does point of application mean?
The place where the force makes contact with the structure
Which internal force pushes parts in opposite directions?
shear
Name ONE thing that can help cause an avalanche.
Heavy wind, large snowfall, rising temperatures, moving rocks, skier/snowboarder
What is a breakwater used for?
To protect coastal areas from the force of large waves
Is gravity a contact or non-contact force?
Non-contact force
A strong wind pushes against the left side of a house. Name TWO things we could use to describe that force.
Direction, magnitude, point of application
Two people pull on opposite ends of a rope. What internal force is created in the rope?
tension
Are earthquakes an internal or external force acting on a building?
External force
A community gets frequent earthquakes. Name ONE way its buildings could be designed to reduce damage.
Allow the building to bend/deform without collapsing or absorb shock
A soccer ball is sitting still. A player kicks it and it begins moving. What caused the change?
A force from the kick