Scalar vs Vector?
What is the difference between a scalar and a vector?
Scalar = magnitude only. Vector = magnitude + direction.
What does distance measure?
The total path traveled.
Which describes speed and which describes velocity: 55 mph; 55 mph east?
55 mph = speed. 55 mph east = velocity.
What does acceleration describe?
How quickly velocity changes.
A student walks 30 m in 10 s. Use your formula sheet to calculate the student's speed.
3 m/s.
Is 25 meters a scalar or vector quantity? Explain.
Scalar. It gives magnitude but no direction.
What does displacement measure?
The change in position from start to finish, including direction.
Which statement describes velocity: 60 mph or 60 mph north?
60 mph north.
True or False: An object must be speeding up if it is accelerating.
False. Acceleration means velocity is changing; the object may speed up, slow down, or change direction.
A car changes velocity from 5 m/s to 15 m/s in 5 s. Use your formula sheet to calculate its acceleration.
2 m/s^2.
Is 15 m/s east a scalar or vector?
Vector, because it includes magnitude and direction.
You walk 10 m east and stop. What are your distance and displacement?
Distance = 10 m. Displacement = 10 m east
A student walks 20 m in 5 s. Calculate the student's speed.
4 m/s.
A car is traveling 10 m/s. Five seconds later it is traveling 25 m/s. What happened to the car's motion?
Its velocity increased, so the car accelerated.
[ (25 - 10)/5 = 3 m/s^2. ]
A car travels 100 m in 20 s. What information are you given? What motion quantity can you calculate?
Given: distance = 100 m and time = 20 s. You can calculate speed = 5 m/s.
Classify each: distance, displacement, speed, velocity, acceleration.
Scalars: distance and speed. Vectors: displacement, velocity, acceleration.
You walk 10 m east and then 4 m west. What are your distance and displacement?
Distance = 14 m. Displacement = 6 m east.
A car travels 120 m east in 20 s. Calculate its average velocity.
6 m/s east.
A car's velocity changes from 10 m/s to 30 m/s in 5 s. Calculate its acceleration.
4 m/s^2.
A skateboarder travels at 6 m/s for 8 s. How far does the skateboarder travel?
48 m.
Two cars both travel at 50 mph. Car A travels east and Car B travels west. Do they have the same speed? Do they have the same velocity?
Same speed; different velocity because their directions differ.
You walk 20 m east and then 20 m west back to where you started. What are your distance and displacement?
Distance = 40 m. Displacement = 0 m.
A student walks 50 m down a hallway and then 50 m back to the exact starting point. What total distance did the student travel, and what is the displacement?
Distance = 100 m. Displacement = 0 m.
A bicycle is traveling at 20 m/s and slows to 5 m/s in 3 s. Calculate its acceleration.
-5 m/s^2.
Scooter 1 travels 80 m in 10 s. Scooter 2 travels 90 m in 15 s. Which scooter is moving faster? Show both calculations.
Scooter 1: 8 m/s. Scooter 2: 6 m/s. Scooter 1 is faster.