Calculating Speed Lesson

Calculating Speed

Objective: Calculate speed, distance or time when given two of the three variables.

Poll

Be Honest: How well do you understand the concepts of speed, velocity, distance and displacement?

• Oh yea! I got it!

• Pretty good.

• I think I understand.

• I am lost!!!!

Multiple Choice

Vocabulary Check:

What is a measurement of how far you have traveled from your original position? (has direction)

• Distance

• Displacement

• Speed

• Distraction

Multiple Choice

Vocabulary Check:

What is the difference between speed and velocity

• Speed is based on time and velocity is not

• Velocity has distance and speed does not

• Speed has direction

• Velocity has direction

Fill in the Blank

In order to calculate speed, first I need to know the units. Standard units for speed are _?

Calculating Speed Steps

• Write the equation (ex. s=d/t)

• Plug in what you know

• Solve for the missing variable

• use correct units

• circle answer

Solve

• First write formula s=d/t

• Plug in 50 for distance

• Plug in 25 for time

• 50/25 =2

• 2 m/s

Multiple Choice

Juan ran 72 m across the football field in 8 seconds. What was his speed?

• 8 m/s

• 576 m/s

• 7 m

• 9 m/s

Multiple Choice

Steve runs 20 m North in 4 seconds. What is his velocity

• 5 m/s

• 4 m/s south

• 5 m/s south

• 5 m/s north

Multiple Choice

If a car is going 125 m/s for 13 seconds, how far does it go?

• 9.61 meters

• 1625 meters

• 1562 seconds

• 138 m/s

Multiple Choice

A boat is going 87 m/s. How long will it take him to go 1 km? (Hint: convert km to meters)

• .087 seconds

• 11.49 seconds

• .0087 seconds

• 87,000 seconds