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Calculating Speed

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What is speed?

Speed is a measurement of the rate of change of an object’s position over a period of time

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I.e. how fast an object is moving!

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Formula for Calculating Speed

Speed= distance time

Speed= how fast object is moving

Distance= how far object has moved

Time= how long it traveled

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-Diagrams-

Describe each car’s motion. Explain.

(Vocabulary: constant speed, acceleration).

A.

B.

  • Constant velocity = No acceleration. No change in motion.
  • Speeding up / Slowing down = Acceleration/Deceleration. Change in motion.

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Units of Measurement

Distance: meters (m), miles (m), inches (in), kilometers (km), centimeters (c)

Time: seconds (s), minutes (m), hours (h)

Speed: meters per second (m/s), miles per hour (mph), kilometers per hour (kph)

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Example 1

If a car travels 40m in 2 seconds how fast is it going?

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Example 2

You arrive in my class 45 seconds after leaving math which is 90 meters away. How fast did you travel?

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Example 3

A plane travels 500 miles in 2 hours. What was its speed?

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Position Diagrams

Which car is moving at a constant speed?

Which car is decelerating/slowing down?

Which car is accelerating/getting faster?

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A.

B.

C.

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Speed Problem Worksheet Formulas

Speed = distance time

Distance = speed x time

Time = distance speed

If a car travels at 60 mph for 2 hours, how far has it gone?

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