Elasticity

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

A graph of extension against force for an elastic material is:

• A downward curve

• An upward curve

• A straight line from any point on the x and y axis

• A straight line from the origin

Which statement most accurately represents Hooke's Law?

• Extension of a spring is proportional to the number of coils

• Thickness of a spring wire is proportional to the force applied.

• Extension of a spring is proportional to the force applied.

• Extension of a spring is inversely proportional to the force applied.

Which graph shows the correct relationship between the force, F, and the extension, x of a spring?

• A

• B

• C

• D

For a metal wire, Hooke's Law is valid upto..........

• breaking point

• proportionality limit

• yield point

• elastic limit

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

• 0mm

• 3mm

• 2mm

• 1mm

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

• Point A is the limit of proportionality

• Point A is the limit of extension.

• Point A is the optimum force.

• Point A is the limit of force.

If a spring is extended beyonds it elastic limit, what two things does this mean for the spring?

• The spring will no longer return to its original length.

• The spring will bounce back to its original length.

• The spring will no longer extend.

• The spring will no longer obey Hookes Law.

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

• 4cm

• 5cm

• 3m

• 3cm

What Quantity can you calculate from the graph and give the magnitude of that quantity.  

• spring constant 200 N/m

• distance 4.5 m

• Force 15 N

• spring constant 20 N/m

Tags

NGSS.HS-PS2-1