AP C Forces Unit Guide

uNITGUIDE

Dynamics (Forces)AP Physics

Who am I?

What are we going to learn?

Schedule

How arewe going to learn?

How will we be evaluated?

CONTACT

Summary Video

Usefulresources

Prior Knowledge

Who I am

Ms. Klein I teach all physics on campus and have taught integrated science.

Email: Madelynn.klein@guhsdaz.orgRM: K302

How to reach me

Wed & Thurs: After school till 3:35pm WLC & before school everyday

When is tutoring

My door is always open if you areconcerned about your grades! I will do my best to help you achieve your academic goals, but you still need to put in the work!

Grade concerns

1

2

3

Types of Forces

Newton's 3 Laws

Examples of Forces in 2D

Systems and Center of Mass

Different types of interactions have different names and results.

Newton came up with 3 Laws that help dsecribe object interactions.

Multiple objects can interact in multiple dimensions whihc affects the motion.

Forces aren't stuck in linear motion!

Forces start when multiple objects interact with one another.

Circular Motion

Subtopics in Dynamics

What are we going to learn?

Dynamics

Timeline

Newton's 3 Laws

Types of Forces

Systems and Center of mass

working with multiple objects interacting at once

THROUGHOUT the unit learning about specific types of interactions

THROUGHOUT the unit studying Newton's Laws of Motion

Circular Motion

2D Forces

THROUGHOUT the unit working in multiple dimensions

learning about how objects move in circles based on our understanding of forces.

• Determining the system
• Locating its center of mass

Topics include difference between objets and systems, calculating center of mass, understanding motion of the center of mass

Systems

Timeline: 2-3 Days

We'll be working in 2D configurations with no more than 5 objects

Even though we are in a new unit, we will still be using kinematics :)

• Algebra skills
• PEMDAS and SADMEP (inverse operations :) )
• Arithmetic skills
• Kinematic equations (last unit)

What are we going to need?

Skills that are necessary to be successful in this unit

• Vector math
• Basic trigonometry skills

• Non-linear motion described with linear terms.
• Description of circular orbits (w/ math)
• Discussion of non-uniform orbits

"All forces share certain common characteristics when considered by observers in inertial reference frames. An observer in a reference frame can describe the motion of an object using such quantities as position, displacement, distance, velocity, speed, and acceleration." -AP Classroom

Circular Motion

Our Gravitational Force equation will change due to the bigger scale (orbits)

All our math will be for uniform circular motion but we will discuss non-uniform circular motion conceptually.

Summary VIDEO

• Labs and hands-on activities
• Labs include a formal lab write up (I will provide a template)
• Activites are 1-pagers
• Direct instruction
• Used to introduce new topics

How are we going to learn?

Learning Activities that I use the most

• Group Practice
• Worksheets as well as practice problems with the whole class
• Independent Practice
• Worksheets
• Quizzes

• Inertia
• Force and acceleration
• Force pairs
• Applications

"Objects and systems have properties of inertial mass and gravitational mass that are experimentally verified to be the same and that satisfy conservation principles." "A force exerted on an object is always due to the interaction of that object with another object."-AP Classroom

Newton's 3 Laws

Make sure to have a labeled diagram and a list of your knowns and unknowns!

Always write the full equation you are using BEFORE plugging in values.

Tentative Schedule

• https://www.aplusphysics.com/ap1/ap1-supp.html
• Practice problems with explanations
• http://hyperphysics.phy-astr.gsu.edu/hbase/index.html#mechcon

Useful resources

Outside resources that are going to be helpul as you study

• https://physics.info/motion-graphs/problems.shtml
• Online textbook with practice
• https://www.physicsclassroom.com
• https://www.flippingphysics.com/ap-physics-1.html

Videos 2-4 introduction to force, mass. and weightV

Link

Flipping Physics

• Balanced v. Unbalnced in x- or y-dimensions
• Net force and direction
• Description of motion

"Free-body diagrams are useful tools for visualizing forces being exerted on a single object and writing the equations that represent a physical situation." -AP Classroom

2D Forces

Make sure you know which directions are positive and which directions are negative. This will change the math in your problem!

Right triangles are your best friend when working in 2D!

Videos on Systems and Center of Mass

Flipping physics

Link

Changing our POV Videos 10-26 for circular motion (anything before is for rotational kinematics later in the year)

Circular Motion

Link

How will we be evaluated?

Grade break down (also found on syllabus) Extra Credit is offered at my discretion

Link

Videos 7-16 are related to Newton's 3 Laws and their applications.

Newton's 3 Laws of Motion

Always write down what you are given and what you want to find!

Draw and label diagrams of the problem!

Link

Videos 35-40 focus on inclined forces and other 2D applications.

Forces in 2D

• Weight Lab
• Spring Lab
• Atwoods/Friction Lab
• Naming all forces

"At the macroscopic level, forces can be categorized as either long-range (action-ata-distance) forces or contact forces." -AP classroom

Forces

Always begin the problem with a labeled diagram of the scenario! Otherwise known as an FBD

Make a list of all of your knowns and unknowns vi= vf= xi= xf= t= a= m= F= This way you don't have to reread a problem when plugging values into the equation.

• How to be a physicist
• Taking measurements
• Identifying variables
• Writing procedures
• Communicating results

What are we going to learn?

The second unit of AP Physics is Dynamics and it covers Newton's 3 Laws of Motion

• The physics
• Newton's 3 laws of motion
• Different types of forces and what they do
• Working with vectors