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New Motion Graphs

QuestionAnswer
What is speed? How fast an object moves.
What is velocity? Speed with direction.
What is acceleration? A change in velocity over time.
What is distance? The total path an object travels.
What is position? An object's location relative to a reference point.
What is a reference point? A place used to describe an object's position.
What is constant velocity? The same speed in the same direction.
What is slope? How steep a graph is; its meaning depends on the graph type.
What is the main difference between speed and velocity? Velocity includes direction; speed does not.
Can two objects have the same speed but different velocities? Yes. They can move at the same speed in different directions.
What does a positive velocity tell you? The object is moving in the chosen positive direction.
What does a negative velocity tell you? The object is moving in the chosen negative direction.
Does negative velocity automatically mean an object is slowing down? No. Negative velocity describes direction.
What happens to velocity when an object changes direction? Velocity changes, even if the speed stays the same.
What are three ways velocity can change? An object can speed up, slow down, or change direction.
Can an object accelerate while moving at the same speed? Yes. Changing direction changes velocity, so acceleration occurs.
What is the acceleration of an object moving at constant velocity? Zero acceleration.
What should you check FIRST when looking at a motion graph? Read the axes to determine the graph type.
What is usually shown on the x-axis of a motion graph? Time.
What does the y-axis show on a distance-time graph? Total distance traveled.
What does the y-axis show on a position-time graph? Position relative to a reference point.
What does the y-axis show on a velocity-time graph? Velocity.
What does slope represent on a distance-time graph? Speed.
What does a steeper distance-time line represent? A faster speed.
What does a straight rising line on a distance-time graph show? Constant speed.
What does a horizontal line on a distance-time graph show? The object is stopped.
Can total distance traveled normally decrease? No. Total distance stays the same or increases.
How can you tell from a table that an object has constant speed? It travels equal distances during equal time intervals.
How can you tell from a table that an object is speeding up? It travels greater distances during equal time intervals.
How can you tell from a table that an object is slowing down? It travels smaller distances during equal time intervals.
A car travels 5 m, then 8 m, then 11 m during equal time intervals. What is happening? The car is speeding up.
A car travels 12 m during every 3-second interval. What type of motion is shown? Constant speed.
What does slope represent on a position-time graph? Velocity, including direction.
What does an upward-sloping position-time graph show? The object is moving in the positive direction.
What does a downward-sloping position-time graph show? The object is moving in the negative direction.
What does a horizontal position-time line show? The object is stopped.
Does crossing position 0 mean an object stopped? No. It may simply pass the reference point.
Does crossing position 0 automatically mean an object changed direction? No. Crossing the reference point is not automatically a reversal.
How can a position-time graph show a direction change? Its slope changes from positive to negative or negative to positive.
What does a steeper position-time line tell you? The magnitude of the object's velocity is greater.
What does a curved position-time graph indicate? The object's velocity is changing.
If a position-time curve becomes steeper over time, what is happening to speed? The object's speed is increasing.
Two position-time graphs are straight, but one is steeper. Which object is faster? The object represented by the steeper line.
What does a horizontal line ABOVE zero on a velocity-time graph show? Constant positive velocity and zero acceleration.
What does a horizontal line BELOW zero on a velocity-time graph show? Constant negative velocity and zero acceleration.
What does a horizontal line AT zero on a velocity-time graph show? The object is stopped.
Why does a horizontal line not always mean stopped? On a velocity-time graph, a horizontal line above or below zero means constant velocity.
What does the height of a line on a velocity-time graph tell you? The object's velocity.
What does the slope of a velocity-time graph tell you? How the velocity is changing, or acceleration.
What does an upward slope on a velocity-time graph represent? Positive acceleration.
What does a downward slope on a velocity-time graph represent? Negative acceleration.
Does an upward-sloping velocity-time graph always mean speeding up? No. You must also consider whether velocity is positive or negative.
Does a downward-sloping velocity-time graph always mean slowing down? No. You must also consider the direction and magnitude of velocity.
An object's velocity changes from +3 m/s to +8 m/s. What happens to its speed? Its speed increases.
An object's velocity changes from +8 m/s to +3 m/s. What happens to its speed? Its speed decreases.
An object's velocity changes from -8 m/s to -3 m/s. What happens to its speed? Its speed decreases because the magnitude becomes smaller.
An object's velocity changes from -3 m/s to -8 m/s. What happens to its speed? Its speed increases because the magnitude becomes larger.
What does it mean when velocity changes from positive to negative? The object changes direction.
What does it mean when velocity changes from negative to positive? The object changes direction.
What happens when a velocity-time graph crosses the zero-velocity line? The object changes direction if the sign of velocity changes.
What happens at the instant velocity equals 0 m/s? The object is momentarily stopped.
An object has a velocity of +6 m/s. Another has -6 m/s. How do their speeds compare? They have the same speed but move in opposite directions.
A cart moves at -4 m/s for several seconds. Is it accelerating? No. If velocity stays at -4 m/s, acceleration is zero.
A cart moves at +5 m/s for several seconds. Is it accelerating? No. Constant velocity means zero acceleration.
Why is “the object is moving, so it is accelerating” incorrect? An object can move at constant velocity with zero acceleration.
How do you calculate speed? Divide distance traveled by time.
A toy car travels 32 m in 8 s. What is its speed? 4 m/s.
A runner travels 45 m in 9 s. What is the runner's speed? 5 m/s.
Car A travels 24 m in 4 s. Car B travels 35 m in 5 s. Which car is faster? Car B. Car A travels 6 m/s and Car B travels 7 m/s.
Object A travels 30 m in 5 s. Object B travels 42 m in 7 s. Compare their speeds. Both move at 6 m/s.
Why can't you decide which object is faster using distance alone? Speed depends on both distance and time.
Why can't you decide which object is faster using time alone? The distances traveled may be different.
How do you compare speeds on two distance-time graphs? Compare their slopes.
How do you recognize constant velocity on a position-time graph? The graph is a straight line with constant slope.
How do you recognize changing velocity on a position-time graph? The slope changes.
How do you recognize zero acceleration on a velocity-time graph? Velocity stays constant, so the line is horizontal.
A velocity-time graph rises, becomes horizontal, and then falls while staying above zero. Describe the motion. The object speeds up, moves at constant velocity, then slows while continuing in the positive direction.
A distance-time graph rises, becomes steeper, and then becomes horizontal. Describe the motion. The object moves, speeds up, and then stops.
A position-time graph rises, becomes horizontal, and then falls. Describe the motion. The object moves in one direction, stops, and then moves in the opposite direction.
How should you analyze a graph with several sections? Analyze each time interval separately, then combine them into one motion story.
What evidence supports a claim that one object is faster on a distance-time graph? Its line has a greater slope.
What evidence supports a claim that an object stopped on a distance-time graph? The line is horizontal during that interval.
What evidence supports a claim that an object stopped on a position-time graph? Its position remains constant, creating a horizontal line.
What evidence supports a claim of constant velocity on a velocity-time graph? The velocity remains unchanged, creating a horizontal line.
What evidence shows that an object is accelerating? Its velocity changes over time.
What evidence shows a direction change on a velocity-time graph? Velocity crosses zero and changes sign.
What evidence shows a direction change on a position-time graph? The slope changes from positive to negative or negative to positive.
If position decreases while total distance increases, can both graphs be correct? Yes. The object can move in the negative direction while total distance continues increasing.
An object moves at constant positive velocity. What should its position-time graph look like? A straight line with positive slope.
An object moves at constant negative velocity. What should its position-time graph look like? A straight line with negative slope.
An object moves at constant speed without changing direction. What should its distance-time graph look like? A straight rising line.
What three graph patterns fit constant positive velocity? Position rises steadily, distance rises steadily, and velocity stays above zero.
What three graph patterns fit constant negative velocity? Position decreases steadily, distance increases steadily, and velocity stays below zero.
Why can two graphs with the same line shape have different meanings? The meaning depends on what each axis represents.
What does “Same shape does not mean same meaning” remind you to do? Read the axes before interpreting the graph.
A horizontal distance-time line and a horizontal velocity-time line are shown. Do they mean the same thing? No. Distance-time means stopped; velocity-time can mean constant velocity.
If two students make different claims about a motion graph, how should you decide who is correct? Compare each claim with evidence from the graph.
What should you do when an answer sounds reasonable but does not match the graph? Reject it and use the evidence shown by the graph or data.
When comparing a table and a graph, what should you look for? Look for patterns showing constant motion, changing speed, direction, or changing velocity.
What is the best routine for solving a motion-graph question? Read the axes, find zero, examine the line and slope, describe the motion, then use evidence.
Created by: user-1962177
 

 



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