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Grade 9 TECHNOLOGY (Term 1)

Terms in this set (19)

A good example of this force is seen in a pair of scissors. The two handles exert forces in a different direction on the pin holding the blades together.
twisting force
TRUE or FALSE
Rafters must help support the weight of the roof and can never withstand compressive forces.
false
A load that exerts an equal force over the whole structure that supports it, is called an / a:
even load
TRUE or FALSE
Shear forces act in a way that pulls parts of a single beam in two opposite directions at the same time.
true
These types of loads cause vibrations and they fluctuate (change all the time).
dynamic
TRUE or FALSE
A torsion force twists a beam in a clockwise direction.
false
A moving load is known as a:
dynamic
TRUE or FALSE
An Arch bridge is no different to a Suspension bridge.
false
Orthographic projections display:
Center, hidden, visible lines
TWO possible materials that can be used in the construction of abridge :
concrete and steel
Forces can:
Push, pull, twist
Forces that cause tension are called:
pulling forces
A / an _____________ is a beam that is anchored at only one end.
Cantilever
The upper half of the beam feels a weight acting down upon it. It is under a ________________.
compressive force
An ___________ drawing gives the designer a clearer idea of what the final object will look like.
isometric
A load that exerts an equal force over the whole structure that supports it, is called an ________ load.
even
A tensile force pulls on a member and ___________ it.
lengthens
A torsion force ________ a beam, either in a clockwise or anticlockwise direction.
twists
To prevent a tower structure from twisting, you can use _________ inside the frame structure.
cross-bracing
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