We will finish our study of forces the week of 11/18-21, and take the unit test on Thursday the 21st.

Friday we will start on circular motion: Forces that change direction not speed.

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# Category: Unit 2: Dynamics

## 11/21: Test on forces

## 11/18 Force FRQ practice

## 11/15 Quiz on forces; homework

## 19-11-14: A few force videos

## Video list

*Flipping Physics: ***Introduction to Free Body Diagrams or Force diagrams**

Continue reading “19-11-14: A few force videos”
## 19-11-14 Getting ready for forces quiz

## What you need to know for tomorrow’s quiz:

## Additional resources

## 11/13 Force diagrams: Two solved problems

## Problem A

## Problem B

## 19-11-13 Wed

Learn Physics – Mr. Trampleasure

Resources for high school physics students and teachers

We will finish our study of forces the week of 11/18-21, and take the unit test on Thursday the 21st.

Friday we will start on circular motion: Forces that change direction not speed.

Today we will work on the 2019 released FRQ Problem 2.

You can find the released problem and problem grading rubric here. We are working on Problem 2 (image above) which focuses on forces.

- You will be able to use the green AP Physics 1 equation sheet for the quiz.
- You will need a
**scientific calculator**. - The quiz consists of two problems, one on each side of the sheet.

To prepare for next week’s test, be sure to review the video tutorials here.

If you don’t have a scientific calculator by the test next week, I will be happy to provide you with a table of trigonometric identities and teach you how to use it (*I guess I’m a dinosaur–this is how I learned to do SOHCAHTOA, and we didn’t call it that*).

The videos today are all from Flipping Physics.

- Introduction to Free Body Diagrams or Force Diagrams
- 5 Steps to Solve any Free Body Diagram Problem
- A Three Force Example of Newton’s 2nd Law with Components
- AP Physics 1: Dynamics Review (Newton’s 3 Laws and Friction)

Remember that as you watch these videos, when a problem/question is presented, try writing out the answer before you continue with the video–then check yourself as you progress through the video.

Today’s assignment from textbook:

*p. 110-112*:** 20, 37, 38, 39, 41 and 51**.

- Use of first five equations in your equation sheet
- Draw force diagrams
- Evaluate forces to determine balanced/unbalanced net force
- Special circumstances/types of problems
- Solve problems with pulleys (pulleys change direction of tension, not magnitude)
- Solve problems with ramps

- Solve problems with forces at angles
- Break down forces into x and y components
- Solve triangle math using SOHCAHTOA and law of sines

You an find instructional/tutorial videos here.

Force diagrams, or Free Body Diagrams, are sketches we use in physics to show forces applied to an object or system of objects.

Here are a couple of videos I created to help walk you through some complicated problems. I encourage you to pause them as you go through and see if you can determine the ‘next move.’

A 13 kg block of wood slides across the floor with constant speed when it is pulled with a horizontal force of 32 N. What is the friction constant, µ, between the wood and the floor?

A block is sliding up a wall with a constant velocity, and a force applied upwards at an angle. Here is a sketch:

For classwork and homework, complete problems 35-39, on page 112 of College Physics.