Motion Distance, Displacement, & S/D/T

Motion Introduction
Distance, Displacement, & S/D/T

​What we will learn about...

• ​What you need to know

• vocabulary introduction

• ​distance vs displacement

• ​calculating distance and displacement

• ​relationship between speed, distance, and time

Vector vs Scalar Quantities

Vector vs Scalar Quantities

• Scalar - has a magnitude

• Vector - has a magnitude and direction

​What You Need to Know

​Distance vs Displacement

​Distance vs Displacement

• ​distance = scalar quantity

  • ​how much ground has been covered during motion by an object

• ​displacement = vector quantity

  • ​how far from its original position an object is during motion

• ​Remember! Vector quantities have both a magnitude and a direction

Multiple Choice

David walks 3 km north, and then turns east and walks 4 km. What is the distance?

• 7 km

• 3 km

• 4 km

• 1 km

Multiple Choice

Bill runs 400 meters to Andy's house, turns around, and runs 400 meters back home.  What is Bill's displacement?

• 0 meters

• 400 meters

• 800 meters

• 1600 meters

​Example question:

• ​The boy on the bike rides from point A to point C, via point B. What is his distance and displacement?

Multiple Choice

Displacement is distance combined with

• direction

• speed

• velocity

• magnitude

​Speed, distance, time

​Speed, distance, time

• ​speed is a scalar quantity (it only has a magnitude)

• ​we can calculate average speed, distance travelled, or time taken to travel by rearranging 1 formula

• ​you sometimes seen speed represented as 'v' for velocity - we will learn more about velocity next week!

​Example question:

• ​An Olympic runner travels 100m in 9.58 seconds. What is their average speed in m/s?

​Example question:

• ​Whilst driving to work in the morning Miss Hannan travels 14 km. The drive took 30 minutes. What was her average speed in m/s?

​Example question:

• ​Whilst driving to work in the morning Miss Hannan travels 14 km. The drive took 30 minutes. What was her average speed in m/s?

​Example question:

• ​A biker's average speed is 25km/h. They travelled 150km, how long did it take them?

​Example question:

• ​A biker's average speed is 25km/h. They travelled 150km, how long did it take them?

Multiple Choice

Because displacement has a magnitude and direction it is called a ______. 

• distance

• vector

• arrow

• length

Multiple Choice

From the figure, what is the displacement?

• 20 meters

• 25 meters

• 15 meters

• 25 meters NE

Multiple Choice

What is the equation to calculate speed?

• speed = distance/time

• speed = time/distance

• speed = time x distance 

• speed = speed/time 

Multiple Choice

A train travels 25 km in .5 hrs. How fast is the train going?

• 25 miles/hr

• 5 miles/hr

• 125 km/hr

• 50 km/hr

Multiple Choice

How far will a person go if they jog for 2 hours at a speed of 12 km/hr?

• 6 km

• 0.5 km

• 10 km

• 24 km

​Graphing:

Distance vs time

Displacement vs time

​Graphing:
Distance vs time

Displacement vs time

• ​Gives us an indication of a whole 'journey'

• ​Can determine how fast an object is moving and how far it has travelled (and how far it has travelled from its starting position) - speed and velocityere