1 Motion Chapter 9 pages

We are learning to: explain motion We are looking for: an act, process, or instance of changing position through time.

3 Describing and Measuring Motion An object is in motion if the distance from another object is changing. Reference point is a place or object used for comparison to determine if something is in motion.

4 Motion An object is in motion if it changes position relative to a reference point. The standard measurement for distance is a meter. The rate of change in motion is called speed.

Which of the following describes motion? A.A change in mass over time B.A change in position over mass C.A change in distance over time D.A change in mass over distance

How do you know that the car is in motion? A. The distance between the building and car changes. B. The time it takes the car to move is constant. C. The distance between the building and the car stays constant.

What is the SI or metric unit for distance? a)Miles b)Grams c)Meter d)Feet

What is used for comparison to tell if an object is in motion? a)direction b)reference point c)Speed d)velocity

Do this: From what you know about motion- write a paragraph explaining this video clip

We are learning to: explain the difference between speed and velocity We are looking for: Speed = change in distance/ change in time. Velocity = speed + direction of an object. Velocity has a direction, while speed does not.

11 Speed The speed of an object is the distance the object travels in one unit of time. Speed is calculated by dividing the distance by the time: Speed=distance/time v=d/t

12 Types of Speed Constant speed is the speed of an object that does not change. Average speed is an average of all the speeds that an object travels during long period of time.

13 Speed vs. Velocity Velocity is speed with a direction. An object that is traveling at a constant speed can change in velocity if the direction is changing.

What is the formula needed to calculate speed of an object? A.distance x time B.distance / time C.time / distance D.acceleration x time E.I need help!

Joe Shmoe walks 30 meters in 10 seconds. What was his speed? A.5 meters/second B.3 seconds/meter C.3 meters/second D.I need help!

What is the only difference between speed and velocity? A.Speed is more complex while velocity is less complex. B.Velocity is time divided by distance and speed is distance divided by time. C.Velocity requires a direction while speed does not. D.Speed and velocity are calculated differently. E.I need help!

Which of the following is an acceptable unit for velocity? A.Meters per second B.Feet per hour C.Miles per hour South D.Miles per hour E.I need help!

Please copy circle and do this. Speed Fill in three words that closely relate to the one word given. Write a paragraph explaining the significance of each word and how they fit together to form a concept?

We are learning to: explain the difference between speed and velocity and interpret graphs. We are looking for: Speed = change in distance/ change in time. Velocity = speed + direction of an object. Velocity has a direction, while speed does not.

20 Graphing Motion Time is on the x-axis of the graph. Distance is on the y-axis of the graph. The steepness of a line on a graph is called the slope.  The faster the motion, the steeper the slope.  A horizontal line represents an object that is not in motion.

You are asked to create a graph that shows the speed of an object. What should be plotted on the x and y axes? A.Y axis = speed; X axis = time B.Y axis = time; X axis = distance C.Y axis = distance; X axis = time D.Y axis = time; X axis = acceleration

What is this graph showing? A.A person walking at varying speeds. B.A person walking at a constant speed and then stopping to rest. C.A person standing still. D.A person walked three miles.

What does this graph show? A.The object is not moving. B.The object is moving at a constant speed. C.The object is moving at a constant speed then stopped to rest. D.The object is moving at varying speeds. Distance 0 Time D

What does a steep slope of a line on a distance time graph indicate? A.Speed is fast B.Speed is slow C.The object is not moving D.Speed is changing

Graphing Activity Construct a graph in your notes using the data to the right. Be sure to label the x and y axis with correct units. DISTANCE (M)TIME (S)

26 Acceleration Chapter 9, Section 3.

27 What is acceleration? Acceleration is the rate at which velocity changes. Acceleration refers to:  Increasing speed  Decreasing speed  Changing direction

28 Calculating Acceleration Acceleration=v f -v i /t  v f is final velocity  v i is initial velocity  t is time

29 Graphing Acceleration Time is on the x-axis Speed is on the y-axis Graphed line rises the same amount each second shows a linear relationship. Graph of distance versus time is a curved line and shows a nonlinear relationship.

30 Which of the following is NOT an example of acceleration? A.Walking in a straight line at a constant speed B.Approaching a stop sign C.A ball rolling down a hill D.Turning around a corner at a constant speed 10

31 Slowing down is referred to as… A.Positive Acceleration B.Negative Acceleration C.Deceleration D.Both B. and C. 10

32 What is the acceleration of an object that goes from 0  4 m/s in 4 seconds? A.2 meters/second 2 B.16 meters/second 2 C.1 meter/second 2 D.0 meters/second 2 10

33 Review Questions What do you call a stationary object that is used for a comparison to detect motion?  (reference point or reference frame) What describes how fast an object moves?  (speed) What is the type of speed when equal distances are covered in equal time?  (constant speed) What is graphed on the x-axis of a speed graph?  (time) What is graphed on the y-axis of a speed graph?  (distance)

34 Review Questions What do you call the total distance the object traveled divided by the total time it took for the object to move that distance?  (average speed) What do you call speed with direction?  (velocity) What is the formula for calculating speed?  (v = d/t) What is the formula for calculating acceleration?  (a = (v f –v i )/t What do we call the rate in change of velocity?  (acceleration)

35 Review Questions What do we graph on the y-axis of an acceleration graph?  (speed) What do we graph on the x-axis of an acceleration graph?  (time) If a person bikes 30 miles is 3 hours, what is their average speed in miles per hour?  (10 miles/hour)

36 Review Questions If a car changes its speed from 0 miles per hour to 60 miles per hour in 15 seconds, what is the car’s acceleration?  (4 miles per hour per second)

37 Motion is the movement of an object in a certain distance in a certain: A. Space B. Time C. Mass D. Area 10

38 How do you know that the car is in Motion? A. The distance between the building and car changes. B. The time it takes the car to move is constant. C. The distance between the building and the car stays constant. 10

39 You’re sitting on a bus. You feel like the bus is moving backwards, but yet the bus driver assures you that you are not moving. What is the possible explanation for this feeling of movement? A.You were using the bus next to you as your reference point, and that bus began moving forward. B.You were using the windows in your bus as your reference point, and a passenger on your bus put down the windows. C.You were using the person next to you as your reference point, and they switched seats. D.You were using the bus driver as your reference point, and he stood up. 10

40 Joe Shmoe walks 30 meters in 10 seconds. What was his speed? A.5 meters/second B.3 seconds/meter C.3 meters/second D.1/3 meters/second 10

41 What is this graph showing? A.A person walking at varying speeds. B.A person walking at a constant speed and then stopping to rest. C.A person standing still. D.A person walked three miles. 10

42 What is the only difference between speed and velocity? A.Speed is more complex while velocity is less complex. B.Velocity is time divided by distance and speed is distance divided by time. C.Velocity requires a direction while speed does not. D.Speed and velocity are calculated differently. 10

43 Which of the following is an acceptable unit for velocity? A.Meters/second B.Feet per hour C.Miles/hour South D.Miles per hour 10

44 Which of the following is NOT an example of acceleration? A.Walking in a straight line at a constant speed B.Approaching a stop sign C.A ball rolling down a hill D.Turning around a corner at a constant speed 10

45 Slowing down is referred to as… A.Positive Acceleration B.Negative Acceleration C.Deceleration D.Both B. and C. 10

46 What is the acceleration of an object that goes from 0  4 m/s in 4 seconds? A.2 meters/second 2 B.16 meters/second 2 C.1 meter/second 2 D.0 meters/second 2 10