Hooke's law

Hooke's Law fails when a material reaches its:

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

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

Tags

CCSS.8.EE.C.7B

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

• 4cm
• 5cm
• 3m
• 3cm

Tags

CCSS.8.EE.C.7B

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.

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

• distance 4.5 m
• Force 15 N
• spring constant 20 N/m
• spring constant 200 N/m

Tags

NGSS.HS-PS2-1

Which of the following is a true statement regarding springs?

• The higher the value of the spring constant, the stiffer the spring.  
• In Hooke's law, the force exerted by the spring acts in the same direction as displacement.  
• Springs are designed to provide unpredictable variations in force.  
• The force exerted by a spring has a quadratic relationship with the displacement form equilibrium.  

A 25,000 N Car is supported by 4 springs.  If each spring is deflected by 0.040 m what is the spring constant? 

• 160,000 N /m
• 620,000 N/m
• 630,000 N/m
• 120,000 N/m

Tags

NGSS.HS-PS2-1

A stiff material has a:

• high spring constant
• low spring constant
• spring constant of any value
• spring constant which is difficult to predict

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

• 1mm
• 2mm
• 3mm
• 0mm

In which direction is the pictured spring's restoring force acting?

• To the right.
• To the left.
• There is no restoring force.
• Both left and right.