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Which of the following devices works based on Hooke's Law?

Windmill.

Spring scale.

Pendulum.

Electric motor.

In a spring, which of the following will increase the extension of the spring?

Increasing the spring constant.

Decreasing the force applied.

Decreasing the spring constant.

Applying a greater force.

A spring with a spring constant of 50 N/m is stretched by 0.4 m. What is the force required to stretch the spring?

25 N.

200 N.

20 N.

50 N.

Which of the following is the correct statement of Hooke's Law?

The force required to stretch a spring is independent of the displacement.

The force required to stretch a spring is inversely proportional to the displacement of the spring.

The force required to compress a spring is proportional to the displacement.

The force required to stretch a spring is proportional to the displacement of the spring.

Which of the following materials follows Hooke’s Law?

Metal rods.

Rubber bands.

Steel springs (within elastic limits).

All materials.