Podcast
Questions and Answers
What is the relationship between work done and kinetic energy for both carts?
What is the relationship between work done and kinetic energy for both carts?
- The kinetic energy depends only on the distance traveled.
- The work done is equal for both carts, resulting in equal kinetic energy. (correct)
- The work done is greater for the cart with the smaller mass.
- Work done is irrelevant to the mass of the carts.
If the mass of the light plastic cart is smaller than that of the heavy steel cart, what can be inferred about their speeds after being pushed with the same force?
If the mass of the light plastic cart is smaller than that of the heavy steel cart, what can be inferred about their speeds after being pushed with the same force?
- Both carts will have the same final velocity.
- The light plastic cart will have a larger final velocity. (correct)
- The light plastic cart will have a smaller final velocity.
- The heavy steel cart will have a larger final velocity.
How is the change in kinetic energy calculated from work done?
How is the change in kinetic energy calculated from work done?
- Through the relationship KE = m/v.
- By summing the initial and final velocities.
- By applying the formula W = ΔKE. (correct)
- By multiplying mass and distance.
What dictates the final kinetic energy of the carts when the same work is done on both?
What dictates the final kinetic energy of the carts when the same work is done on both?
Why does the heavy steel cart not travel as fast as the light plastic cart after they are pushed?
Why does the heavy steel cart not travel as fast as the light plastic cart after they are pushed?
When comparing the kinetic energy of the light plastic and the heavy steel cart, what is true?
When comparing the kinetic energy of the light plastic and the heavy steel cart, what is true?
What does the equation v² = 2W/m indicate about the speeds of the carts?
What does the equation v² = 2W/m indicate about the speeds of the carts?
Which of the following correctly expresses why kinetic energy remains equal for both carts after being pushed?
Which of the following correctly expresses why kinetic energy remains equal for both carts after being pushed?
Flashcards
Kinetic Energy
Kinetic Energy
The amount of energy an object possesses due to its motion.
Work
Work
The product of force and the distance over which the force acts.
Work-Energy Theorem
Work-Energy Theorem
The theorem stating that the work done on an object equals the change in its kinetic energy.
Mass
Mass
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Velocity
Velocity
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Work-Kinetic Energy Relationship
Work-Kinetic Energy Relationship
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At Rest
At Rest
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Mass and Velocity Relationship
Mass and Velocity Relationship
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Study Notes
Work-Energy Theorem and Kinetic Energy for Two Carts
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Equal Work, Different Masses: Two carts, one plastic and one steel, are pushed with the same force over the same distance. This means the work done on each cart is equal.
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Work-Energy Theorem Application: The work-energy theorem states that the work done on an object equals the change in its kinetic energy. Therefore, the change in kinetic energy is the same for both carts.
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Kinetic Energy Formula: Kinetic energy (KE) is calculated as KE = (1/2)mv². This shows that KE depends on both mass (m) and velocity (v).
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Velocity Relation: Rearranging the kinetic energy equation, we find that v² = (2W/m). This crucial equation reveals an inverse relationship between velocity squared and mass. If the work (W) is the same for both carts, the cart with the smaller mass will have a larger velocity to achieve the same change in kinetic energy.
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Kinetic Energy Comparison: The light plastic cart will have a greater velocity, while the heavier steel cart will have a smaller velocity. Despite these differences in velocity, the kinetic energy of both carts ends up being equal. The increase in velocity compensates for the decreased velocity caused by the higher mass.
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