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Velocity-Time

QuestionAnswer
What is velocity? Speed with direction.
What is acceleration? A change in velocity over time.
What is constant velocity? The same speed in the same direction.
What is the main difference between speed and velocity? Velocity includes direction; speed does not.
What does a negative velocity tell you? The object is moving in the negative direction, not automatically slowing down.
What are three ways velocity can change? An object can speed up, slow down, or change direction.
What is the acceleration of an object moving at constant velocity? Zero acceleration.
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.
What does the slope of a velocity-time graph tell you? How 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 a downward-sloping velocity-time graph always mean slowing down? No. You must consider the sign and magnitude of velocity.
What happens when velocity changes from positive to negative? The object changes direction.
What happens when velocity changes from negative to positive? The object changes direction.
An object has velocities of +6 m/s and -6 m/s. How do their speeds compare? The speeds are equal; only the directions are different.
A velocity-time graph rises, becomes horizontal, then falls while staying above zero. Describe the motion. The object speeds up, moves at constant velocity, then slows while continuing forward.
Car A travels 24 m in 4 s. Car B travels 35 m in 5 s. Which car is faster? Car B. Car A moves 6 m/s and Car B moves 7 m/s.
What is the best routine for solving a motion-graph question? Read the axes, find zero, check the slope, describe the motion, and use evidence.
Created by: user-1962177
 

 



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