Mr. Lambert Integrated Science 1A Trimester 2, 2014 Distance-time graphs Mr. Lambert Integrated Science 1A Trimester 2, 2014

Bell Ringer Draw a distance-time graph that depicts the motion of the woman: A woman walks 300 meters to get to the post office. She stops for a short time and realizes that she left the stove on in her house. She quickly runs home.

Agenda Finish Distance-time graphs Speed Probe challenge Velocity Instantaneous speed handout Exit Slip

Learning Targets On your Bell Ringer Sheet, write the following: We will interpret distance-time graphs We will differentiate speed and velocity

Downward sloping line – object returning to start Distance Downward sloping line – object returning to start

Simulation – the moving man http://phet.colorado.edu/en/simulation/moving-man

Distance-time graphs

Distance-time graphs

Draw the following scenario A man walks forward at a constant speed. Suddenly a dog starts to chase him and he begins to run. The man manages to outrun the dog and stops to take a break and catch his breath. The man then slowly walks back to his starting point.

Which of the graphs shows that one of runners started 10 yards further ahead of the other? Explain your answer.

In which of the following graphs above are both runners moving at the same speed? Explain your answer.

Challenge: match the motion in the following graphs! Speed probe Challenge: match the motion in the following graphs!

Speed – Derryl drove his car at 60 mph. Velocity Speed with direction! Speed – Derryl drove his car at 60 mph. Velocity – Derryl drove North in his car at 60 mph

Speed or velocity? Micah threw a football 75 meters in 3 seconds. How fast did the football travel? A bee flew West to sting Sammy. It flew 3 meters in 1.25 seconds. How fast was the bee flying? Jessica drove 100 miles North in 2 hours. How fast was she traveling?

Instantaneous vs average speed Instantaneous speed – speed at one instant in time https://www.youtube.com/watch?v=pfTT Hx9kCHk Instantaneous vs average speed worksheet

Review for the QUIZ tomorrow! If you do not understand the material, go to the website!

Kelsey walked 90 meters in 10 seconds. What was her average speed? 9 m/s

Sarah swam 500m in 30 sec. How many meters per second did she swim? 16.7 m/s

James was training to be on the football team James was training to be on the football team. He would time himself as he ran around his neighborhood. He knew his neighborhood was 1 Km long and could run around it in 60s. What was his average speed? 0.017 km/s

“Sketch that Graph” Follow the 3 steps: Draw the x-axis and y- axis Label the x-axis as time, and the y-axis as distance Sketch the graph!

“Sketch that Graph” #1 Jessie left the house and walked to the movies at a slow leisurely pace. She stayed for the movie, then began walking home again at a leisurely pace. Half way home it began to pour, so she ran the rest of the way home. Sketch the graph of her motion.

“Sketch that Graph” #2 A jogger runs for 10 minutes at 3.5 mph, for 45 minutes at 6 mph and cools down for 5 minutes at 2.5 mph. Sketch a graph of the joggers horizontal motion.

“Sketch that Graph” #3 A grizzly bear meanders slowly through the meadow, stops when he smells some fragrant berries, then continues on his way. Sketch the graph of this motion in the horizontal direction.

“Sketch that Graph” #4 Brittany was driving at 60 mph and crashed into a tree. One hour later, an ambulance came and took her to the hospital at 80 mph. After her checkup, she was ok and took a taxi home at 50 mph.

Exit Slip What is the difference between speed and velocity? A Smart Car and a Mustang had a race. The Smart Car had an average speed of 60 mph. The Mustang had an instantaneous speed of 120 mph. Which car won the race? https://www.youtube.com/watch?v=pvbF6kDhWyU