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Linear Motion

Linear Motion. Objects Moving in a Straight Line. Unit 2: Goals. In this unit you will: Represent motion through the use of words, motion maps and graphs. Use the terms position, distance, displacement, speed and velocity in a scientific manner to describe motion.

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Linear Motion

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  1. Linear Motion Objects Moving in a Straight Line

  2. Unit 2: Goals • In this unit you will: • Represent motion through the use of words, motion maps and graphs. • Use the terms position, distance, displacement, speed and velocity in a scientific manner to describe motion. • In physics, the study of motion is sometimes referred to as KINEMATICS.

  3. Picturing Motion • Perceiving motion is instinctive—your eyes pay more attention to moving objects than to stationary ones. Movement is all around you. • Movement travels in many directions, such as the straight-line path of a bowling ball in a lane’s gutter, the curved path of a tether ball, the spiral of a falling kite, and the swirls of water circling a drain. • When an object is in motion, its position changes. Its position can change along the path of a straight line, a circle, an arc, or a back-and-forth vibration.

  4. Motion in a Straight Line • A description of motion relates to speed and time. You must be able to answer the questions of “where?” and “when?” an object is positioned to describe its motion. • Position= location

  5. Movement of a car In the picture below, the car moves from point A to point B.

  6. Vectors and Scalars • A scalar quantity is just the magnitude (amount). • Speed is a scalar. • For example: 50 meters/second. • A vector quantity indicates not only the amount, but the direction, too. • Velocity is a vector. • For example: 50 meters/second, North.

  7. Distance and Displacement • Distance refers to how far an object travels. • This is a scalar quantity. -For example: the car traveled 35km. • Displacement refers to how far the object travels, but also adds direction. • This is a vector quantity. -For example: the car traveled 35km, North.

  8. Speed • Speed is how fast an object is traveling. • This is a scalar quantity. -For example: 55m/s • Average speed: speed over a time interval. • Instantaneous speed: speed “right now”

  9. Velocity • Velocity is how fast an object is traveling, but direction is also indicated. -For example: The train traveled at 55m/s, South.

  10. A helpful website: • www.Physicsclassroom.com • Designed to help you with definitions, concepts and examples to try. • We will be using this site in class often, but it is also accessible from home! • For Unit 2 Linear Motion: • See Physics Tutorial – 1-D Kinematics

  11. What is a Motion Map? • A motion map is a series of images that represents the movement of some object. • It consists of a particle (dot) to represent the position of an object and an arrow to represent the speed and direction the object is moving. • See the motion map reading handout.

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