Simple Machines
What simple machine is a wheel with a rod through its centre?
wheel and axle
What is a force?
A push or pull on an object.
What is the simplest type of bridge?
Beam Bridge
What natural disaster happens when the Earth's plates shift?
Earthquakes
Is gravity an internal or external force?
External Force
What simple machine uses a grooved wheel and a rope to lift loads?
Pulley
What force pulls all objects toward the center of the Earth?
Gravity
What kind of bridge uses a semicircular shape for strength?
Arch Bridge
What natural disaster involves large amounts of snow rushing down a slope?
Avalanche
What type of force acts from within a structure?
Internal Force
What simple machine is two inclined planes placed back-to-back?
Wedge
List 2 example of Natural Forces?
Wind & Snow
What type of bridge uses cables from tall structures for support?
Suspension Bridge
What natural disaster caused major flooding in New Orleans in 2005?
Hurricane Katrina
Name two examples of internal forces.
Compression, tension, shear, and torsion
Name all three simple machines.
Lever, Inclined Plane, Pulley, Wheel and Axle, Screw, Wedge
What happens if a structure isn't strong enough to withstand forces?
It may fail or collapse.
What is special about a truss bridge's design?
It uses triangles for extra strength.
Name one way people prepare for hurricanes.
Emergency kits, evacuation plans
Give an example of an external force that could damage a building.
Wind, water, earthquake
Which simple machine is used to move heavy objects over a vertical obstacle, like loading a truck?
Inclined Plane
What is the term used to describe the measurement of intensity of a force?
Magnitude
Why do we need different types of bridges?
Different needs, terrains, loads
What causes an avalanche to happen?
Heavy snow, melting and refreezing, or human movement.
What is the difference between static and dynamic loads?
static stays constant; dynamic changes over time