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Motion Review

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  • How can you tell an object has moved?
    The object's position changes compared to a reference frame.
  • Explain why rate and speed are considered the same thing.
    Both divide distance by time.
  • What does a horizontal line on the x axis on a speed vs time graph represent?
    motionless
  • What does negative slope represent on a speed vs time graph?
    slowing down
  • What does a curved line represent on a distance vs time graph?
    non-constant speed (acceleration)
  • Describe the acceleration of the object using each section of the graph
    positive, zero, positive, negative
  • Explain the difference between speed and acceleration.
    Speed only considers the distance and object moves in a given time, which acceleration includes how quickly the speed is changing in a given time with direction
  • What is negative acceleration?
    slowing down
  • What is the unit for rate?
    m/s
  • Describe the motion of the object using the graph.
    accelerating quickly, constant speed, slow acceleration, slow deceleration
  • What is the unit for distance?
    m (km)
  • Explain why a car turning a corner at a constant speed of 20 m/s is not traveling at a constant velocity.
    Because the direction of the car is changing, velocity is not constant (vector).
  • What does "delta v" represent?
    change in velocity (final velocity minus initial velocity)
  • What is positive acceleration?
    speeding up
  • Calculate the speed of the object during the third section of movement
    S=? D=30m T=3s S=D/T S=30m/3s S=10m/s
  • What is displacement?
    An object's ending position compared to its starting point.
  • How do you calculate distance?
    Add up all of the lengths to get a total distance.
  • Draw a graph for a person who walks up a hill at a constant speed, across the top, and down the other side.
    See Graph on Board
  • Define scalar.
    A quantity that includes only magnitude (size).
  • Explain the motion of the object in the graph.
    slow constant speed away from start, stopped, slow constant speed away from start, fast constant speed home
  • What does a horizontal line above the x axis represent on a speed vs time graph represent?
    constant speed
  • When does an object's velocity change?
    speed up, slow down, change direction
  • What does a diagonal, straight line represent on a distance vs time graph?
    constant speed
  • Define vector.
    A quantity that includes both magnitude (size) and direction.
  • What is the unit for velocity?
    m/s + direction
  • What is the unit for acceleration?
    m/s/s
  • Which term(s) is(are) scalar: distance, displacement, speed, rate, velocity, acceleration
    distance, speed, rate
  • What is the unit for speed?
    m/s
  • What does a straight, diagonal line represent on a speed vs time graph?
    constant acceleration
  • What does a horizontal line on a distance vs time graph represent?
    motionless
  • How quickly an object is moving at a certain time is its...
    instantaneous speed
  • What does negative slope represent on a distance vs time graph?
    going back to start
  • How do you calculate average speed?
    total distance divided by total time
  • Define distance.
    Total length of an object's path.
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