Share Science- Structures Review
Save to Folder
What are the 3 properties of air?
Air takes up space, air has mass (weight), air can be compressed
How do we use the properties of air in our daily lives?
Answers range.
What are the four forces acting upon a flight?
lift, weight, thrust, drag
What is air?
A mixture of gases
What is flight?
A movement of an object through the air
When a plane takes off what forces must be greater?
Lift and thrust must be greater than weight and drag.
When a plane lands, what forces must be lessened?
Thrust and lift
What is the difference between a static and dynamic load?
A static load is a force that does not move (like the weight of a roof). A dynamic load is a force that moves or changes (like wind or a person walking).
List one example of protective equipment that keep humans safe and name the force.
Answers vary
What is the difference between an internal and external force?
An internal force acts inside a structure (within the materials). An external force comes from outside and acts on a structure.
A measure of the intensity of a force is know as ...
magnitude
_____ is an internal force when an object is pressed inwards
Compression
____bridges are the simplest type of bridges. They have a horizontal beam and deck.
Beam bridge
Tension on the bridge cables is an internal or external force?
internal force
A skydiver parachutes out of a plane towards the ground is a contact or non-contact force?
non-contact
