Air takes up space, air has mass (weight), air can be compressed
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25
____bridges are the simplest type of bridges. They have a horizontal beam and deck.
Beam bridge
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20
How do we use the properties of air in our daily lives?
Answers range.
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20
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).
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thief
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seesaw
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gift
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lifesaver
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15
Tension on the bridge cables is an internal or external force?
internal force
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20
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.
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banana
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seesaw
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gift
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banana
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20
List one example of protective equipment that keep humans safe and name the force.
Answers vary
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15
_____ is an internal force when an object is pressed inwards
Compression
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trap
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rocket
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rocket
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thief
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20
What is flight?
A movement of an object through the air
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15
A skydiver parachutes out of a plane towards the ground is a contact or non-contact force?
non-contact
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20
When a plane takes off what forces must be greater?
Lift and thrust must be greater than weight and drag.
