The Man’s Jeopardy

Learning Objectives Determine when an object is in motion. Demonstrate how to graph motion (with graphs and examples). Calculate an object’s speed and velocity (provide examples and be sure to note the difference between speed and velocity). Describe the motion of an object as it accelerates. Calculate acceleration (with examples). Describe how graphs are used to analyze the motion of an accelerating object.

RULES There will be round robin play and all questions will be all-play except for the daily doubles. The teams who answers correctly win the point value of the question. If a team answers a daily double incorrectly, then that team will lose the number of points they bid, and any other team can “ring in” by raising their hand and answer at that point. There are two daily doubles available. Let’s play

Final Jeopardy Speed & Velocity Graphing Motion Motion Accel. 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 Final Jeopardy

Motion for 100 When the distance between you and another object is changing, you are considered to be in __________. Motion

Motion for 200 A person, place, or thing used to determine if an object is in motion is called a __________ point. Reference

Motion for 300 Suppose you are bungee jumping off a bridge. Describe your motion relative to the ground and the bungee cord. Ground- you are moving towards it (and then away from it) Bungee Cord- You’re not moving (distance isn’t changing).

A horizontal line above 0 on a distance-time graph. Motion for 400 Sketch a distance-time graph for an object that is NOT in motion, but is a certain distance from a reference point. A horizontal line above 0 on a distance-time graph.

Motion for 500 Why do cops use their radar gun only when they are stationary? If they didn’t stay still, your speed would seem slower than what it actually is.

Speed & Velocity for 100 The total distance an object travels divided by total time it takes to travel that distance is equal to an object’s ________ speed, while an object’s _________ can be determined if you know its speed and direction. Average; Velocity

Speed & Velocity for 200 Which of the following is an example of an object traveling at a constant speed? A car going from rest to 60 mph. A speedboat slowing down from 30 to 15 mph. A person jogging at 6 mph for an hour straight.

Speed & Velocity for 300 Draw a speed-time graph showing an object speeding up. Speed on the y-axis with time on the x-axis and a straight line going up and to the right.

Speed & Velocity for 400 On a distance-time graph, how do you tell the object that’s moving at a greater speed? The object that corresponds to the steeper slope is moving faster.

Speed & Velocity DAILY DOUBLE! What does a flat horizontal line on a SPEED-TIME graph indicate? So, is the object accelerating or decelerating? How do you know? The object is moving at a constant speed, so its speed is not changing. Therefore, it has no acceleration or deceleration.

Acceleration for 100 The rate at which velocity changes over a certain period of time is called a(n) _____________. acceleration

Speed up, slow down, change direction Acceleration for 200 What are the 3 ways that an object can accelerate (either positively or negatively)? Speed up, slow down, change direction

meters per second per second (m/s/s or m/s2) Acceleration for 300 If you measure an object’s velocity in meters per second, then what are the units for acceleration? meters per second per second (m/s/s or m/s2)

Acceleration DAILY DOUBLE!!! Suppose you are jogging at 7 mph and after 20 minutes, you are jogging at 5 mph for the rest of the run. This is an example of a _____________. Deceleration, because you slowed down

Determine the slope of the line = rise/run = speed/time Acceleration for 500 How do you determine the acceleration of an object by using a SPEED-TIME graph? Determine the slope of the line = rise/run = speed/time

Y-axis = Dep. Variable = Distance in meters Graphing Motion for 100 For the distance vs. time graph to the right, what is the independent variable (or manipulated variable)? What is the dependent variable (or responding variable)? X-axis = Ind. Variable = Time in sec. Y-axis = Dep. Variable = Distance in meters D (m) Time (s)

No movement from 0 to 1s, then moved at a constant speed from 1-3s. Graphing Motion for 200 What happened between 0 and 1 second? What happened between 1 and 3 seconds? No movement from 0 to 1s, then moved at a constant speed from 1-3s. D (m) Time (s)

Graphing Motion for 300 What is the average speed of the object from 1 to 3 seconds? 2 m/2 s = 1 m/s D (m) Time (s)

Graphing Motion for 400 Describe the motion of the object from the velocity-time graph to the right. What is the average acceleration of the object for the entire 6 seconds? The object is speeding up or accelerating at 2 m/s/s.

Graphing Motion for 500 How far did the object travel in the last 4 seconds? 4 m/s (the velocity for the last 4 sec.) x 4 s (the time) = 16 m

Acceleration Suppose you are traveling in a plane at 240 m/s. The plane descends, lands, and comes to a stop in 2 minutes. What is the plane’s acceleration? Units are crucial for this problem. 2 minutes = 120 seconds (0 m/s – 240 m/s)/120 seconds = -2 m/s/s