Hooke’s Law

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

A spring has a spring constant of 5N/cm.  What is its extension when loaded with 15N?

• 4cm
• 5cm
• 3m
• 3cm

A spring extends 1.5m under load 10N. What is its spring constant?

• 0.15N/m
• 10N/m
• 6.7N/m
• 15N/m

If extension = Stretched length - original length. What is the extension of spring D.

• 1mm
• 2mm
• 3mm
• 0mm

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