Hooke's Law 1.0

What force (unit in N) is necessary to stretch an ideal spring with a spring constant of 120 N/m by 30 cm?

A spring with a spring constant of 600 N/m is used for a scale to weigh fish. What is the mass (in kg) of a fish that would stretch the spring by 7.5 cm from its normal length?

(use gravitational acceleration is 10 m/s²)

A spring in a pogo-stick is compressed 12 cm when a 40 kg boy stands on it. What is the spring constant for the pogo-stick spring? (spring constant unit in N/m)

A spring is connected to a wall and a horizontal force of 80.0 N is applied. It stretches 25 cm, what is its spring constant?

A spring stretches 8.0 cm when a 13 N force is applied. How far (in cm) does it stretch when a 26 N is applied?

An elastic cord is 80.0 cm long when it is supporting a mass of 10.0 kg hanging from it at rest. When an additional 4.0 kg is added, the cord is 82.5 cm long. What is the spring constant?
(hint : the spring is still elastic deformation)

An elastic cord is 80. cm long when it is supporting a mass of 10. kg hanging from it at rest. When an additional 4.0 kg is added, the cord is 82.5 cm long. What is the original length (in cm) of the cord (with no mass)?

The graph shown was plotted in an experiment on a metal wire.

• A

• B

• C

• D

The variation of the extension x of a spring with applied force F is shown

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the graph shows how the extension of a spring varies with the force used to stretch it

• 60 J

• 600 J

• 120 J

• 1200 J