Unit I – Forces & Motion – “Straight Line Motion” Essential Question: 7.P.1.1 - Explain how the motion of an object can be described by its position, direction of motion, and speed with respect to some other object.

Lesson Objectives By the end of this lesson students will be able to: I. Describe the motion of an object in terms of its change in position over time compared to a reference point. II. Explain why motion can only be described in comparison to a reference point.

Lesson Questions By the end of this lesson, students will be able to answer: I. What is motion, and how can we describe the motion of an object? II. Why is it necessary to have a reference point(s) in identifying the movement of an object?

Getting to Know: Straight- Line Motion A train moves down a track. A billiard ball rolls across a table. Red blood cells move through blood vessels. Our lives are filled with objects in motion, the subject of this lesson. What do you think motion is? Video Segment: Mythbusters – The Physics of Pitching

I. What is motion, and how can we describe the motion of an object? Motion is defined as change in position over time. However, an object’s change in position can only be described by comparing it to an observer or another object, called a reference point or frame of reference. Apparent motion changes with different reference points. For example, when you are sitting at your desk, you do not appear to be in motion compared to the room around you. Yet, compared to the Sun, you are moving quickly through space on Earth’s surface. Interactive Video Segment – Constant Speed Found on discovery education Click on Unit: Forces & Motion Concept: Straight Line Motion Click on the Explore Tab Click on the Interactive video. Download the Interactive video quiz – Constant Speed on Schoology Save the document to your Virtual pages notebook.

II. Why is it necessary to have a reference point(s) in identifying the movement of an object? Misconception: All moving objects slow down over time. Here on Earth, the force of friction opposes the motion of objects and slows them down. But without friction, objects can keep moving indefinitely. The planets and other objects in the solar system have been moving at the same speeds for billions of years! Remember: Motion is the change in an object's position over time. Both motion and position can be measured only in comparison to other objects. For example, a tree is motionless relative to Earth. But Earth rotates on its axis and revolves around the sun. So all objects on Earth move in these ways, too. Exploration – On The Move Found on Discovery Education Download the worksheet on schoology Complete the virtual lab exploration worksheet

Blog Entry – Section 1-1 “Straight Line Motion” Quick Review Blog Entry – Section 1-1 “Straight Line Motion” Students will login to the schoology website provided by the teacher. Students will complete the blog entry posted by the teacher. If you cannot finish, finish the blog entry for homework