Hooke´s Law

If a mass of 0.55 kg attached to a vertical

spring stretches the spring 36 cm from its original equilibrium

position, what is the spring constant?

k =−mg÷x

• 15

• 19 N/m

• 15 N/m

• 19 N

A load of 45 N attached to a spring that is hanging vertically stretches the spring

0.14 m. What is the spring constant?

F_elastic = -kx

• 3.2 x 10² N/m

• 2.7 x 10³ N/m

• 15 N/m

• 8.1 x 10³ N/m

How much force is required to pull a spring 3.0 cm from its equilibrium position if

the spring constant is 2.7 × 10³ N/m?

F_elastic = –kx

• .081 N

• .81 N

• 81 N

• 8.1 N

A slingshot consists of a light leather cup attached between two rubber bands.

If it takes a force of 32 N to stretch the bands 1.2 cm, what is the equivalent spring

constant of the two rubber bands?

F_elastic = -kx

• 3.2 x 10² N/m

• 2.7 x 10³ N/m

• 15 N/m

• 3.2 x 10³ N/m

A scale with a spring constant of 420 N/m is

compressed 4.3 cm. What is the spring force?

F_elastic = –kx

• -18 N

• 18 N

• 81 N

• 20 N