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# CH 12.1 Forces

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Author: deirdre carney
##### Description:
• Describe examples of force and identify appropriate SI units used to measure force
• Explain how the motion of an object is affected when balanced & unbalanced forces act on it
• Compare and contrast the four kinds of friction
• Describe how Earth's gravity & air resistance affect falling objects
• Describe the path of a projectile and identify the forces that produce projectile motion

P.12.B  Students understand the interactions between force and motion.

Next Generation Science Standards

HS-PS2-b Use mathematical expressions to support the claim that the total momentum of a system of objects is conserved when there is no net force on the system.

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Tutorial

## Introduction to Forces

Pay special attention to definitions of acceleration, speed, and velocity.

## Ch 12.1 Forces

Outline the reading in your Science Notebook & include major points and diagrams/tables.
You should focus on the following essential questions:
-How do forces affect the motion of an object
-What are the four main types of friction
-How do gravity and air resistance affect a falling object
-In what direction does Earth's gravity act
-Why does a projectile follow a curved path

Full Screen

Source: Prentice Hall Physical Science - Concepts in Action

## Video Clip: Forces in Motion

This video is designed to help students explore the concepts of what a force is, inertia, friction, and balanced vs. unbalanced forces.

Be sure to take notes in your Science Notebook

## Video Clip: Galileo's "falling bodies" demo

Recreation of Galileo's experiment. Pay attention to gravity and air resistance relationship.
Take notes in your Science Notebook.

## Video Clip: Bill Nye - Friction

Explore the affect of friction on motion. Take notes in your Science Notebook.