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# Section 2.1-1 - PowerPoint PPT Presentation

In this section you will:. Draw motion diagrams to describe motion. Develop a particle model to represent a moving object. Section 2.1-1. All Kinds of Motion.

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Presentation Transcript

• Draw motion diagrams to describe motion.

• Develop a particle model to represent a moving object.

Section 2.1-1

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.

Section 2.1-2

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.

Section 2.1-3

A description of motion relates to place and time. You must be able to answer the questions of where and when an object is positioned to describe its motion.

Section 2.1-4

In the figure below, the car has moved from point A to point B in a specific time period.

Section 2.1-5

Click image to view movie.

Section 2.1-6

Explain how applying the particle model produces a simplified version of a motion diagram?

Section 2.1-7

Answer: Keeping track of the motion of the runner is easier if we disregard the movements of the arms and the legs, and instead concentrate on a single point at the center of the body. In effect, we can disregard the fact that the runner has some size and imagine that the runner is a very small object located precisely at that central point. A particle model is a simplified version of a motion diagram in which the object in motion is replaced by a series of single points.

Section 2.1-8

Which statement describes best the motion diagram of an object in motion?

A. a graph of the time data on a horizontal axis and the position on a vertical axis

B. a series of images showing the positions of a moving object at equal time intervals

C. a diagram in which the object in motion is replaced by a series of single points

D. a diagram that tells us the location of the zero point of the object in motion and the direction in which the object is moving

Section 2.1-9

Reason:A series of images showing the positions of a moving object at equal time intervals is called a motion diagram.

Section 2.1-10

What is the purpose of drawing a motion diagram or a particle model?

A. to calculate the speed of the object in motion

B. to calculate the distance covered by the object in a particular time

C. to check whether an object is in motion

D. to calculate the instantaneous velocity of the object in motion

Section 2.1-11

Reason:In a motion diagram or a particle model, we relate the motion of the object with the background, which indicates that relative to the background, only the object is in motion.

Section 2.1-12