Advanced Science Primary 6 Interactions

Spring A and Spring B have the same original length of 10 cm. When a 100g load is hung on Spring A, it extends by 2 cm. When the same load is hung on Spring B, it extends by 4 cm. Which spring is stiffer?

A Stiffness cannot be determined without knowing the final length.
B Spring B
C They have the same stiffness.
D Spring A
Show Worked Solution

Worked Solution

Step 1: Stiffness is the resistance to extension. Step [2-9]: Spring A extends less (2cm) compared to Spring B (4cm) under the same load (100g). Step [2-9]: Therefore, Spring A requires more force to produce the same extension, making it stiffer.

Correct answer: Spring A

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