Introduction

AP® Physics

1. Basics

2. Kinematics

3. Forces & Newton's Laws

4. Torque & Rotational Dynamics

5. Centripetal Force & Orbits

6. Energy, Work & Power

7. Momentum & Collisions

8. Simple Harmonic Motion & Waves

Even if you've never played with a spring before, you've definitely used something that has a spring inside: a mattress, a watch, a retractable pen, a scale, or maybe a door that closes on its own. All of these things rely on a spring force to function.

The **spring force** is pretty simple: if you pull the ends of a spring apart the spring gets longer, and if you push the ends of a spring
together the spring gets shorter. And we know from
**Newton's 3rd law**
that if you pull or push a spring, the spring pulls or pushes you back with the same force.

In this lesson we'll cover **Hooke's law** which relates the spring force and the amount that the spring changes length, which depends
on the **spring constant** (which describes the stiffness of the spring). We're only going to work with what we
call "ideal springs", which means the spring force varies linearly with the change in length.

We'll also learn about combining springs in **series** and in **parallel** to get an "equivalent spring constant".

Finally, we'll learn how this spring-like behavior applies to the **elasticity of materials**. A rubber band is one example, but it turns out that
everything stretches when you apply a force to it - every material actually behaves like a spring.

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3

Spring Force and Hooke's Law

Elasticity of Materials

1

**Answers**

2

- Spring Force

- Flipping Physics - Hooke's Law Introduction - Force of a Spring
- Matt Anderson - Horizontal vs vertical springs
- Equivalent Springs in Series and Parallel

- Elasticity of Materials

Even if you've never played with a spring before, you've definitely used something that has a spring inside: a mattress, a watch, a retractable pen, a scale, or maybe a door that closes on its own. All of these things rely on a spring force to function.

The **spring force** is pretty simple: if you pull the ends of a spring apart the spring gets longer, and if you push the ends of a spring
together the spring gets shorter. And we know from
**Newton's 3rd law**
that if you pull or push a spring, the spring pulls or pushes you back with the same force.

In this lesson we'll cover **Hooke's law** which relates the spring force and the amount that the spring changes length, which depends
on the **spring constant** (which describes the stiffness of the spring). We're only going to work with what we
call "ideal springs", which means the spring force varies linearly with the change in length.

We'll also learn about combining springs in **series** and in **parallel** to get an "equivalent spring constant".

Finally, we'll learn how this spring-like behavior applies to the **elasticity of materials**. A rubber band is one example, but it turns out that
everything stretches when you apply a force to it - every material actually behaves like a spring.

1. Spring Force

2. Elasticity of Materials

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