Coach Book Ch. 2 Lesson 6 Motion Graphs

An object's location relative to a reference point.

Position

A stationary object. Once you have a reference point, motion can be defined in terms of position, direction and speed.

Reference Point

Motion - A change in an object's location over time.

Speed is the distance traveled per unit of time Speed is a unit rate that describes how fast something is moving.

Speed = Distance/Time

Most objects do not move at a constant, unchanging speed. When you use the formula to calculate speed, you are calculating the average speed of an object.

Who was faster?

Malik and Andrew both walked for 15 minutes. Malik walked 1 kilometer. Andrew walked 2 kilometers. Calculate each person's speed. Who walked faster?

Which runner(s) ran at a constant velocity?
Which runner stopped running for 10 seconds?
If runner B continued to run at the same avg. speed, how far would she run after 2 minutes?

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Explain this graph.

Notice how in a velocity-time graph, a flat line represents constant velocity (no acceleration). What is happening during seconds 7-10?

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Velocity-Time Graphs

Multiple Choice

The graph shows the velocity of a plane over time. Which statement about the motion of the plane is true?

• The plane decelerates for the first 15 minutes.

  
  

• The plane steadily accelerates over the entire journey.

• The plane accelerates between minutes of 15 minutes and 20.

• 
  The plane does not accelerate between minutes 15 and 20.

Multiple Choice

A red car and a blue car both traveled 300 km between Bakersville and Smithtown. The red car completed the trip in 4 hours. The blue car completed the trip in 3 hours. How fast was the red car travelling?

• 
  75 km per hour

• 
  1200 km per hour

• 100 km per hour

• 900 km per hour

Multiple Choice

A red car and a blue car both traveled 300 km between Bakersville and Smithtown. The red car completed the trip in 4 hours. The blue car completed the trip in 3 hours. How fast was the blue car travelling?

• 75 km per hour

• 
  1200 km per hour

• 100 km per hour

• 
  900 km per hour

Multiple Choice

Who ran at a constant velocity for 30 minutes?

• Runner A

• Runner B

• Runner C

Multiple Choice

Who stopped running for 5 minutes before starting again?

• runner

• Runner B

• Runner A

Multiple Choice

What is the runner's average speed?

• 
  1/4 m/s

• 
  4 m/s

• 
  40 m/s

• 
  10 m/s

Multiple Choice

Which data table represents an object that is decelerating?

Multiple Choice

A rocket is travelling through the atmosphere at a constant velocity. Which of the following is true?

• The rocket's engine is producing an unbalanced force that keeps the rocket in the air.

• The rocket exerts a greater force on its exhaust gases than the gases exerted on the rocket.

• All the forces acting on the rocket are balanced.

• 
  The rocket is moving, so some net force must be acting on it.