Podcast
Questions and Answers
What can the officer estimate for the original speed of the car if the skid marks are 10 m long and the typical deceleration is -45 m/s²?
What can the officer estimate for the original speed of the car if the skid marks are 10 m long and the typical deceleration is -45 m/s²?
30 m/s
What is the final velocity of the Road Runner after accelerating from rest at 3 mi/s² for 10 seconds?
What is the final velocity of the Road Runner after accelerating from rest at 3 mi/s² for 10 seconds?
30 mi/s
How far does the Road Runner travel during a 10 second time interval if it accelerates at 3 mi/s² from rest?
How far does the Road Runner travel during a 10 second time interval if it accelerates at 3 mi/s² from rest?
150 mi
What is the velocity of the bullet as it leaves the barrel if it accelerates at 4000 m/s² down a 0.5 m long barrel starting from rest?
What is the velocity of the bullet as it leaves the barrel if it accelerates at 4000 m/s² down a 0.5 m long barrel starting from rest?
What is the acceleration of the car that traveled at 20 m/s and came to a stop in 4 seconds?
What is the acceleration of the car that traveled at 20 m/s and came to a stop in 4 seconds?
How far did the USS Enterprise travel if it accelerated from rest at 100,000 m/s² in 4 seconds?
How far did the USS Enterprise travel if it accelerated from rest at 100,000 m/s² in 4 seconds?
What is the final velocity of a skier who starts at 5 m/s and accelerates down a hill at 1 m/s² for 3 seconds?
What is the final velocity of a skier who starts at 5 m/s and accelerates down a hill at 1 m/s² for 3 seconds?
What is the acceleration of a train that decreases speed from 30 m/s to 20 m/s while traveling a distance of 250 m?
What is the acceleration of a train that decreases speed from 30 m/s to 20 m/s while traveling a distance of 250 m?
What is the final velocity of a car that travels at 25 m/s to the north with an acceleration of 2 m/s² to the south for 20 seconds?
What is the final velocity of a car that travels at 25 m/s to the north with an acceleration of 2 m/s² to the south for 20 seconds?
What is the displacement of a car traveling at 25 m/s to the North with an acceleration of 2 m/s² to the South for 20 seconds?
What is the displacement of a car traveling at 25 m/s to the North with an acceleration of 2 m/s² to the South for 20 seconds?
How far did Hobbes' hands move back while catching the balloon that was thrown to him at a speed of 1 m/s and experienced an acceleration of -0.5 m/s²?
How far did Hobbes' hands move back while catching the balloon that was thrown to him at a speed of 1 m/s and experienced an acceleration of -0.5 m/s²?
Flashcards
Instantaneous Velocity
Instantaneous Velocity
The speed of an object at a specific moment in time.
Acceleration
Acceleration
Rate at which velocity changes over time.
Skid Marks Incident
Skid Marks Incident
A car leaves a 10 m skid mark while decelerating at -45 m/s². Kinematics equations can determine the car's initial speed.
Road Runner Acceleration
Road Runner Acceleration
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Bullet's Exit Velocity
Bullet's Exit Velocity
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Car's Deceleration
Car's Deceleration
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USS Enterprise's Distance
USS Enterprise's Distance
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Train's Acceleration
Train's Acceleration
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Displacement
Displacement
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Water Balloon Catching
Water Balloon Catching
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Study Notes
Kinematics Practice Problems Overview
- Focus on calculating velocity, acceleration, distance, and displacement in various scenarios.
- Problems involve different objects such as cars, bullets, trains, and fictional characters.
Problem Highlights
- Skid Marks Incident: A car with a 10 m long skid mark has a deceleration of -45 m/s², allowing estimation of its initial speed.
- Road Runner Acceleration: Starting from rest, the Road Runner accelerates at 3 mi/s² for 10 seconds, which facilitates the calculation of its final velocity.
- Travel Distance of Road Runner: With the same acceleration, during the same 10 seconds, the Road Runner covers a total distance, showcasing the relationship between acceleration, time, and distance.
- Bullet's Exit Velocity: A bullet accelerating at 4000 m/s² over a barrel length of 0.5 m can have its exit velocity determined directly.
- Car's Deceleration: A car traveling initially at 20 m/s comes to a stop in 4 seconds, enabling the calculation of its negative acceleration.
- USS Enterprise's Distance: Accelerating from rest at 100,000 m/s² for 4 seconds allows for the computation of the total distance traveled.
Additional Calculations
- Skier's Final Velocity and Displacement: A skier with an initial speed of 5 m/s, accelerating at 1 m/s² for 3 seconds, results in calculations for both final velocity and displacement.
- Train's Acceleration: A train reducing speed from 30 m/s to 20 m/s over a distance of 250 m has its acceleration calculated as negative.
- Car's Final Velocity and Displacement (with Acceleration): A car initially at 25 m/s moving south at 2 m/s² deceleration for 20 seconds ends with a negative final velocity; displacement during this time is also calculated.
Miscellaneous
- Water Balloon Catching: When a water balloon traveling at 1 m/s is caught, which leads it to experience a negative acceleration of -0.5 m/s² until at rest, the movement of Hobbes's hands can be analyzed to find the distance over which the balloon decelerates.
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