Podcast
Questions and Answers
What is the average speed of Sid the Sloth during his run?
What is the average speed of Sid the Sloth during his run?
- 25.5 m/s
- 9.7 m/s
- 8.5 m/s (correct)
- 16.8 m/s
If a car slows from 20 m/s to 5 m/s in 2 seconds, what is the acceleration?
If a car slows from 20 m/s to 5 m/s in 2 seconds, what is the acceleration?
- -15 m/s²
- 5 m/s²
- -10 m/s² (correct)
- 7.5 m/s²
What is the momentum of a 6,000-kilogram truck traveling at 13.0 m/s?
What is the momentum of a 6,000-kilogram truck traveling at 13.0 m/s?
- 78,000 kg·m/s (correct)
- 60,000 kg·m/s
- 6,000 kg·m/s
- 0.78 kg·m/s
If a ball dropped from a building reaches a velocity of 19.6 m/s after 2 seconds, what is its acceleration?
If a ball dropped from a building reaches a velocity of 19.6 m/s after 2 seconds, what is its acceleration?
How much force is exerted on a cart with a mass of 18 kg that accelerates at 3 m/s²?
How much force is exerted on a cart with a mass of 18 kg that accelerates at 3 m/s²?
What is the weight of a 2.2 kg textbook on Earth?
What is the weight of a 2.2 kg textbook on Earth?
If a paper cup accelerates at 25 m/s² with a force of 5 N, what is its weight?
If a paper cup accelerates at 25 m/s² with a force of 5 N, what is its weight?
What is the average velocity of Jonah who walks left 25 m and returns to the starting point in 240 seconds?
What is the average velocity of Jonah who walks left 25 m and returns to the starting point in 240 seconds?
Flashcards
Average Velocity
Average Velocity
Total displacement over the total time.
Average Speed
Average Speed
Total distance over the total time.
Acceleration
Acceleration
Rate of change of velocity over time.
Momentum
Momentum
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Weight
Weight
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Force
Force
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Calculate Average Velocity
Calculate Average Velocity
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Calculate Average Speed
Calculate Average Speed
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Study Notes
Speed vs. Velocity
- Coordinate System: Rightward is the positive direction.
- Sid the Sloth: Ran 80 meters right and 162 meters left in 3 minutes.
- Average velocity (m/s): Calculate displacement and time.
- Average speed (m/s): Calculate total distance and time.
- Jonah: Walked 25 meters to his truck, then back to pick up coffee in 240 seconds.
- Average velocity (over 240 seconds): Calculate total displacement and time.
- Average speed (over 240 seconds): Calculate total distance and time.
- Armani: Walked 30 meters to car, then drove 76 meters in 145 seconds.
- Average velocity (over 145 seconds): Calculate total displacement and time.
- Average speed (over 145 seconds): Calculate total distance and time.
Acceleration
- Runner: Increased speed from 5 m/s to 9 m/s in 4 seconds.
- Acceleration (m/s²): Calculate change in velocity and time.
- Car: Slowed from 20 m/s to 5 m/s in 2 seconds.
- Acceleration (m/s²): Calculate change in velocity and time.
- Dropped Ball: Velocity after 2 seconds is 19.6 m/s.
- Acceleration (m/s²): Calculate acceleration of dropped object.
Momentum
- Beach Ball: Rolling at 0.78 m/s with momentum of 0.22 kgâ‹…m/s.
- Mass (kg): Momentum = mass * velocity.
- Truck: 6,000 kg truck traveling at 13.0 m/s.
- Momentum (kgâ‹…m/s): Momentum = mass * velocity.
Additional Concepts
- Weight (Earth, Mars, Venus): Calculations based on mass (and acceleration due to gravity) for a physical science test book (mass = 2.2 kg, Earth (g = 9.8 m/s²), Mars (g = 3.7 m/s²), Venus (g = not given)).
- Force (cart): Shoving a 18 kg cart with groceries down an aisle at an acceleration of 3 m/s².
- Force (N): Calculate force using mass and acceleration.
- Force (Paper Cup): Wind pushing a paper cup across sand, accelerating at 25 m/s²; the force exerted by the wind = 5N. Calculate weight of the cup
- Acceleration (Friend on Swing): Pushing a 50 kg friend on a swing with 10 N force
- Acceleration (m/s²): Calculate acceleration using force and mass.
- Momentum Calculator: Calculating momentum given various circumstances
- Additional Concepts: Calculate the velocity of a 1,461 kg car given momentum calculations from a truck in a straight line
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