FORCES AND STRUCTURES 3

Certain shapes strengthen structures. 

• True
• False

What is the strongest shape?

• Triangle
• Square
• Circle
• None of the above

Which bridge usually has triangles?

• Suspension

• Arch

• Truss

• none of the above

What do you add to make a rectangle stronger?

• nothing
• starts
• gumdrops
• triangles!

Truss bridges use the _____________ shape to strengthen the structure.

• Ovals
• Trapezoid
• Triangle 
• rectangle

Sitting on a chair is an example of ___________

• Tension

• Compression

• Gravity

• Friction

Tags

NGSS.MS-PS2-4

What is buoyant force?

• An upward force exerted by fluids on an object.
• An downward force exerted by fluids on an object.

An empty water bottle floating on the water is an example of....

• positive buoyancy
• negative buoyoncy

Buoyancy is:

• When an object sinks in liquid

• The ability to float in some liquid material

What does buoyancy depend on?

• The size of an object.

• The color of an object.

• The weight of an object.

• None of the above.