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# 2.0 Unit 2 Overview: Dynamics

#dynamics

#force

written by peter apps

June 11, 2020

Dynamics is the study of the forces, the interactions of an object with another object, that cause objects and systems to move. The basic understanding of force as a push or pull helps to solidify the notion that it is a vector quantity and has both magnitude and direction.

Similar to that of Unit 1, translation is key in Unit 2. You must be able to show the same object–force interactions through different graphs, diagrams, and mathematical relationships. During Unit 2, you will also learn a necessary skill throughout the remaining units of AP Physics 1: how to derive new expressions from fundamental equations to form predictions in unfamiliar scenarios.

The exam weight of this unit is 12-18% and it tends to span over approximately 19-22 forty-five minute class periods.

🎥Watch: AP Physics 1 - Unit 2 - Forces

## Applicable Big Ideas 💨

Big Idea #1: Systems - Objects and systems have properties such as mass and charge. Systems may have internal structure.

Bid Idea #2: Fields - Fields existing in space can be used to explain interactions

Big Idea #3: Force Interactions - The interactions of an object with other objects can be described by forces.

Big Idea #4: Change - Interactions between systems can result in changes in those systems.

## Key Concepts 🔑

• System

• Weight

• Mass

• Contact Forces

• Hooke’s Law

• Friction

• Frame of Reference

• Inertial Mass

• Equilibrium

• Gravitational Mass

• Vector

• Free-Body Diagram

• Action-Reaction Pair

• Net Force

• Angular Tension

• Apparent Weight

## Key Equations 🗝

1. 𝚺F = ma

2. F = mg

3. F = -kx

4. Ff = Fn

5. F = G m1 m2 / r2

6. a = F/m

7. Vf = Vo + at

8. x = Vot + 1/2at2

9. Vf2 = Vo2 + 2ax

10. a = F/m system

11. Vavg = x/t

12. Aavg = v/t