Motion and Velocity

Distance/Displacement What’s the difference? Distance - how far in actual travel. Scalar – measured in quantity- ex: 300 meters around the track. Just like a car’s odometer, it keeps track of how far the car has traveled

Distance/Displacement What’s the difference? Displacement – distance between two points. Vector quantity– it has magnitude and direction. 20 miles Northeast If a car goes 300 meters around the track and winds up where it started, the displacement is 0…..there is no distance between the beginning and ending point..

Each car travels a distance of 2.5 meters from start to finish From start to finish, the car has a displacement of 0 meters Start/Finish Line

DISTANCE vs. DISPLACEMENT animated.html animated.html animated.html animated.html Distance is total amount traveled (scalar quantity) while displacement is the description of the direct path between points using direction (vector quantity)

Let’s Practice Josselyn rides her bike to the nearest Verizon store to get her new phone. The store is 2 km to the north. She then rides 1 km to the south to show her new phone off to Karla. What distance did she travel? What is her displacement?

Let’s Practice James has a hot date with Chanice and picks her up in his car. He takes her dancing at the club which is 15km away. After dancing, they drive back past her house and grab some food at the IHOP, 5 km to the west of her house. What distance did they travel? What is their displacement?

Are these people moving?

Motion A change in position relative to a frame of reference

Frame of Reference Your perspective or viewpoint to determine if an object is moving nce nce

How can you tell something is in motion? It changes position relative to a fixed point w

SPEED Fastest man in the world….who is this? Fastest man in the world….who is this? Usain “Lightening” Bolt Usain “Lightening” Bolt

Buggy Lab Groups of no more than 4 people. Everyone has a job. Write it on your sheet. I should be able to come by and see who should be doing what. Timer Car start Car catcher Marker

Data Table Time (s)Distance (cm) Trial 1 Distance (cm) Trial 2 Distance (cm) Trial 3 Average Distance (cm) 0000 (0+0+0)/3 = …

Lab Report: Title: Constant Velocity Lab Title: Constant Velocity Lab Names of group members Names of group members Purpose: To describe constant motion Purpose: To describe constant motion Materials: Materials: Methods (in full sentences) Methods (in full sentences) Data (in table – time & distance) Data (in table – time & distance) Analysis (graph your average distance, do a line of best fit. Compare two points along the line to get the car’s velocity) Analysis (graph your average distance, do a line of best fit. Compare two points along the line to get the car’s velocity)

Average Distance (cm) Time (seconds) Y=mx + b

Answer the following on your lab report (show your work): 1) According to your data, what is the average speed of your car? 2) A rival team’s car travels.43 meters in 8.2 seconds. Is their car faster or slower than your car? Prove this and show your work.

CHALLENGE QUESTION How Far will your car travel in 8 seconds? How Far will your car travel in 8 seconds?

Speed Formula Speed = distance/time s=d/t units: meter/second, kilometer/hour, etc.