Average Speed
What is the formula for average speed?
What is the formula for speed?
Speed = Distance / Time
What does a flat (horizontal) line on a distance-time graph represent?
The object is not moving
The DISTANCE an object moves during a period of TIME, without considering direction.
Speed
What is the difference between distance and displacement?
Distance is how far something has travelled
Displacement is how far from the start an object is
A car travels 200 kilometers in 4 hours. What is its average speed?
50 km/hr
What is the difference between speed and velocity?
Speed is distance and time
Velocity is distance, time, AND direction
What does a straight line with a positive slope on a distance-time graph mean?
The object has a constant speed going away from the start
The distance an object travels from start to end divided by the total time it takes and it's direction.
Velocity
Describe how displacement can be ZERO
If someone walks and returns to the start point, then displacement would be 0
It takes a student 3 minutes to walk from science to the gym which is 120 meters away, what is their average speed?
40 m/min
Is this speed or velocity?
80 km/hr
Speed
If the line on a distance-time graph is curving upward, what does that tell you about the object’s motion?
The object is speeding up
This is a visual to show the distance travelled and the amount of time an object took to travel
Distance-Time Graph
A car drives 5 km east, then 5 km west. What is the car’s total distance and displacement?
Distance = 10 kilometers
Displacement = 0 kilometers
Two students did a run and timed themselves. Student 1 ran 100 meters in 15 seconds. Student 2 ran 150 meters in 20 seconds. Who ran a faster average speed?
Student 2 ran 7.5 m/s
Is this speed or velocity?
45 m/min north
Velocity
If two lines on a distance-time graph have different slopes, which one is moving faster?
The steeper line (Most vertical)
The difference between the starting position and the final position.
Displacement
A person walks 35 meters north, then 45 meters south. What is the distance and the displacement?
Distance = 80 meters
Displacement = 10 meters south
A cyclist rides 20 km in 40 minutes, then turns around and rides 10 km in 20 minutes. What is their average speed?
0.5 km/min
A sprinter runs 400 meters east in 50 seconds. What is their velocity?
What is 8 m/s east?
What does a line sloping downward on a distance-time graph usually indicate?
Returning to the start point
On a distance-time graph, this represents the speed of an object.
Slope (Or rise/run)
A person walks 150 meters north, then 90 meters west, then 150 meters south. What is their distance and displacement?
Distance = 390 meters
Displacement = 90 meters west