Forces and elasticity

In which side of the graph does the spring obey Hooke's law?

• To the left of point A

• To the right of point A

The graph shows the relationship between force and extension as a spring is extended. What is another name for point A?

• Point A is the elastic limit

• Point A is the elastic summet

• Point A is the plastic limit

• Point A is the extension limit

What is the best description of the relationship shown in this graph?

• In this graph, the relationship between force and extension is linear.

• In this graph, the relationship between force and extension is non-linear.

• In this graph, the relationship between force and extension is directly proportional.

• In this graph, there is no relationship between force and extension.

Hooke's Law fails when a material reaches its:

• breakdown
• elastic limit
• end of tether
• fracture stress

A net force of 430 N acts to stretch an extension spring.  How far will the spring stretch if its spring constant is 700 N/m?

• 43.9
• 0.307 m
• 1.63 m
• 0.614 m

A force of F=500 N is applied to extend a spring.  What is the displacement x of the spring if its spring constant is k= 540 N/m?

• 0.96 m
• 0.93 M
• 1.3 m
• 1.1 m

Which of the following springs is the stiffest?

• A spring that requires a froce of 2000 N to compress it by 6.8 m.
• A spring that requires a force of 4000 N to stretch it by 9.0 m. 
• A spring that requires a force of 8000 N to compress it by 45 m.  
• A spring that requires a force of 4800 N to stretch it by 14 m.

A material that goes back to its original shape when all the forces are removed is described as ...

• inelastic

• elastic

• hard

• soft

A spring has a natural length of 4cm and when masses are added, its new length is 18cm. What is the extension?

• 14cm

• 18cm

• 22cm

• 15cm

What is the relationship between the force applied to a spring and its extension?

• they are negatively correlated

• they are inversely proportional

• they are directly proportional

• they increase