Force and Matter

Hooke's Law describes the behaviour of which kind of material under tension?

• plastic
• metals only
• elastic
• non-metals only

If F is force, k is spring constant and x is extension, Hooke's Law tells us that:

• F=k/x
• x=Fk
• k=Fx
• F=kx

Hooke's Law fails when a material reaches its:

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

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.

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

An unstretched spring becomes longer when a force is applied to it. Which word describes the additional length of the spring gains?

• Expansion

• Extension

• Stretched

An elastic material can change shape when ________ is exerted on it.

• a force

• a moment

• an acceleration

When you apply a force to an object, the object can change shape. If tension is applied, the object may be stretched. We say the object has been __________.

• compressed

• extended

• twisted

When you apply a force to an object, the object can change shape. If a compression force is applied, the object may be squashed. We say the object has been __________.

• compressed

• extended

• twisted

A deformation is a change in _________.

• Speed

• shape

• direction