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Questions and Answers
What does the slope of a velocity vs. time graph represent?
If an object is moving at a constant speed on a velocity vs. time graph, what is the acceleration?
Which of the following statements accurately describes an object with positive acceleration?
What is the relationship between rise and run in the context of a velocity vs. time graph?
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What can be inferred about an object that shows a negative acceleration on a graph?
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What is the formula for calculating acceleration?
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What does positive acceleration indicate?
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If a jet lands from a speed of 80 m/s to 0 m/s in 10 seconds, what is its acceleration?
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A skateboarder accelerates at 1.5 m/s² for 2 seconds from rest. What is his final speed?
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What is the acceleration of a car that accelerates from 25 mi/hr to 55 mi/hr in 0.0083 hr?
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Which of the following describes negative acceleration?
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How is acceleration expressed in units?
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If a car moves at a constant speed, what can be said about its acceleration?
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Study Notes
Acceleration
- Definition: Rate of change of velocity over time.
- Occurs when: Object speeds up, slows down, or changes direction.
- Units: mi/hr², m/s², km/hr²
- Positive Acceleration: Object speeds up.
- Negative Acceleration: Object slows down.
Calculating Acceleration
-
Formula: a = (vf - vi) / t
- vf = final velocity
- vi = initial velocity
- t = time
Example #1
- Car initially traveling at 35 km/hr.
- Accelerates to 45 km/hr in 0.25 hours.
- Acceleration: 40 km/hr²
Example #2
- Jet traveling at 80 m/s.
- Slows down to 0 m/s in 10 seconds.
- Acceleration: -8 m/s² (negative because the jet is slowing down)
Example #3
- Skateboarder accelerates at 1.5 m/s².
- Starts from rest (vi = 0 m/s) and accelerates for 2 seconds.
- Final velocity: 3 m/s
Graphing Acceleration
-
Velocity vs. Time Graphs:
- Slope of the line = Acceleration
-
Distance vs. Time Graphs:
- Used to describe acceleration
- Constant Velocity: Horizontal line; acceleration = 0.
- Increasing Velocity: Curved line; acceleration is positive.
- Decreasing Velocity: Curved line; acceleration is negative.
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Description
Test your understanding of acceleration, including its definition and how to calculate it using formulas. Explore examples of positive and negative acceleration, as well as graphing techniques for visual representation. This quiz covers essential concepts for students studying physics.
