Bridges
A bridge is built to span what?
a gap
This shape is good for pillars
Round
Which shape is the strongest?
A triangle.
What did we use to represent a load in our tests?
weights or books
What kind of tests have we been performing?
Fair tests.
What must a bridge be able to carry or hold?
A load.
This length is good for pillars
Short
What can you add to a beam bridge to make it stronger?
Pillars
Was the foam beam strong without the pillar?
No
When doing a test, if you change one thing what is that called?
The variable.
A beam is most stable when it is laying _______?
flat
This shape of arch supports more weight.
Curved
Adding these to squares and rectangles made them stronger
Cross pieces.
What made the foam beam stop sagging?
A pillar
What is tension?
Stretches or pulls objects apart
A beam is strongest when it is laying _______
On its side.
An arch that is held in place with pressure is called
A keystone arch
This shape is the strongest for pillars
round
Triangle
Describe a stable bridge.
Stable means a bridge can carry a load without moving too much.
We use these to stop the sag.
A pillar
Adding cross pieces to squares and rectangles made what shape?
Triangles.
A beam is stronger when it is laid on its______
edge
Was it easy to build and test the Keystone arch?
Easy to test but took multiple tries to build.
Describe a strong bridge?
A strong bridge can carry a large load without sagging or moving too much.