# Elastic Potential Energy and Combination of Springs

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5.4Elastic Potential Energy and Combination of Springs

## Elastic Potential Energy and Combination of Springs Revision Questions

1. A 2 kg object falls from 8 m above the ground on a spring placed vertically and as a result, it compresses the spring by 4 cm. What is the value of spring constant? For simplicity, take g = 10 N/kg.

1. 200 000 N/m
2. 400 000 N/m
3. 20 N/m
4. 40 N/m

2. A 2 kg object starts sliding from rest down a frictionless slope of maximum height 4 m and when it reaches the bottom, it continues sliding for other 5 m along a horizontal plane by friction coefficient 0.3. Then, the object compresses a spring with constant 2000 N/m. Calculate the spring compression in cm. For simplicity, take g = 10 N/kg.

1. 5 cm
2. 22 cm
3. 62.5 cm
4. 0.22 cm

3. Two springs by constants 60 N/m and 300 N/m are first combined in parallel, then in series as shown in the figure.

What is the ratio kp / ks for the two total spring constants obtained in these combinations?

1. 1
2. 0.14
3. 6
4. 7.2

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