Questions and Answers
What is speed?
What is velocity?
What is acceleration?
The formula for speed is ____.
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The formula for acceleration is ____.
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What is the SI (metric) unit for speed?
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What is the SI (metric) unit for acceleration?
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An acceleration that is positive means you are speeding up.
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An acceleration that is negative means you are speeding up.
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An acceleration that is zero means your speed is not changing.
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What instrument measures the speed in a car?
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What is instantaneous speed?
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If a car is turning left at a constant speed, it is not accelerating.
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If a car is moving forward at a constant speed, it is accelerating.
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What is faster - the speed of sound or the speed of light?
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What is motion?
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What is a reference point?
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What does distance refer to?
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What is displacement?
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Study Notes
Speed, Velocity & Acceleration
- Speed: Rate of motion quantifying how quickly an object changes position.
- Velocity: Combines speed with direction, indicating the object's rate of motion towards a specific point.
- Acceleration: Measures how quickly velocity changes; includes both changes in speed and direction.
Mathematical Formulas
- Speed Formula: Calculated as distance divided by time (distance/time).
- Acceleration Formula: Change in velocity over time ((change in velocity)/time).
Units of Measurement
- Speed Unit: The International System (SI) unit for speed is meters per second (m/s).
- Acceleration Unit: The SI unit for acceleration is meters per second squared (m/s²).
Types of Acceleration
- Positive Acceleration: Indicates an increase in speed; the object is speeding up.
- Negative Acceleration: Signifies a decrease in speed; the object is slowing down.
- Zero Acceleration: Reflects constant speed; no change in speed or direction.
Instruments and Concepts
- Speedometer: Device used to measure the speed of a vehicle.
- Instantaneous Speed: Speed of an object at a specific moment in time.
- Motion: Describes an object's change in position relative to a reference point.
- Reference Point: A location or object utilized to compare and determine if another object is in motion.
Key Comparisons
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Distance vs. Displacement:
- Distance: Total movement regardless of direction.
- Displacement: Straight line measurement from starting position, including direction.
Questions to Consider
- Is a car turning left at a constant speed accelerating? Yes, because it is changing direction.
- Is a car moving forward at a constant speed accelerating? No, as there is no change in speed or direction.
- What is faster, the speed of sound or the speed of light? The speed of light is faster than the speed of sound.
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Test your understanding of the key concepts in speed, velocity, and acceleration with this review flashcard quiz. Ideal for revising fundamental physics terms and formulas, each flashcard provides a clear definition to reinforce your knowledge.