Podcast
Questions and Answers
How does doubling the mass of an object affect its kinetic energy, assuming the velocity remains constant?
How does doubling the mass of an object affect its kinetic energy, assuming the velocity remains constant?
- The kinetic energy quadruples.
- The kinetic energy is halved.
- The kinetic energy remains the same.
- The kinetic energy doubles. (correct)
In what form is energy transferred when an electric appliance is used?
In what form is energy transferred when an electric appliance is used?
- Electric energy to chemical potential energy.
- Chemical energy to gravitational potential energy.
- Electric energy to potential energy.
- Electric energy to another energy form. (correct)
What happens to the total energy ($E_{total}$) in a closed system, according to the law of conservation of energy?
What happens to the total energy ($E_{total}$) in a closed system, according to the law of conservation of energy?
- $E_{total}$ fluctuates randomly.
- $E_{total}$ increases over time.
- $E_{total}$ remains constant. (correct)
- $E_{total}$ decreases over time.
If an object's velocity doubles, how is its kinetic energy ($E_k$) affected?
If an object's velocity doubles, how is its kinetic energy ($E_k$) affected?
Which of the following describes the relationship between gravitational potential energy ($E_g$) and height ($h$)?
Which of the following describes the relationship between gravitational potential energy ($E_g$) and height ($h$)?
In the context of energy transformations, what typically happens to kinetic energy ($E_k$) when friction is present?
In the context of energy transformations, what typically happens to kinetic energy ($E_k$) when friction is present?
What are the units for gravitational potential energy ($E_g$) and kinetic energy ($E_k$)?
What are the units for gravitational potential energy ($E_g$) and kinetic energy ($E_k$)?
Which of the following is an example of energy being transferred, rather than transformed?
Which of the following is an example of energy being transferred, rather than transformed?
A skateboarder is at the top of a ramp. Which type of energy is at its maximum?
A skateboarder is at the top of a ramp. Which type of energy is at its maximum?
If a cat's mass increases, what happens to the cat's total energy ($E_{total}$)?
If a cat's mass increases, what happens to the cat's total energy ($E_{total}$)?
Flashcards
Transferred Energy
Transferred Energy
Energy remains in the same form but changes location.
Transformed Energy
Transformed Energy
Energy changes from one type to another.
Kinetic Energy
Kinetic Energy
Energy associated with motion (mechanical, heat, light, electric, sound).
Potential Energy
Potential Energy
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Law of Conservation of Energy
Law of Conservation of Energy
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What is Eg?
What is Eg?
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What is Ek?
What is Ek?
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What is Et?
What is Et?
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What can you say about Etotal?
What can you say about Etotal?
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Units of Energy, Velocity, Acceleration, Height, and Mass
Units of Energy, Velocity, Acceleration, Height, and Mass
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Study Notes
- Explains how changes in mass, acceleration due to gravity, and height affect gravitational potential energy
- The size of the mass, acceleration, and acceleration due to gravity determine how big or small the gravitational potential energy is.
- Explains how changes in mass and velocity affect kinetic energy
- The higher the mass and velocity the higher the kinetic energy is
- Identifies the relationship (linear, quadratic, inverse, horizontal) between gravitational potential energy, m, g, and h, which is linear/directly proportional
- Identifies the relationship (linear, quadratic, inverse, horizontal) between kinetic energy, m & v
- Kinetic energy and m are linear, so if m doubles, kinetic energy doubles
- Kinetic energy and V are quadratic, so if V doubles, kinetic energy quadruples
- Describes how energy is transferred or transformed in everyday situations
- Transferred energy stays in same form but moves to a different location/object
- Heat transferring from hot to cold is an example of transferred energy
- Transformed energy happens when energy changes form
- Charging a phone, where electric becomes chemical potential, is an example of transformed energy
- Forms that energy can take are kinetic (motion) and potential (storage)
- Kinetic energy can be mechanical, heat, light, electric, or sound
- Potential energy can be chemical (food, battery, explosives), gravitational potential, electric, or magnetic
- Applies the law of conservation of energy to calculate unknown values
- Subtract or add energy values given: kinetic energy + gravitational potential energy = total energy; total energy - gravitational potential energy = kinetic energy; total energy - kinetic energy = gravitational potential energy
- Determines the values of gravitational potential energy or Kinetic energy using conservation of energy
- Energy concepts include the PhET skateboarder activity
- The cat had the most Eg the higher up it was and the highest Ek when it was at the bottom of the ramp
- When the cat's mass was higher the total energy was also higher, and when the cat's mass was smaller the total energy was also smaller
- When there is friction the kinetic energy transforms into thermal energy
- Even though all the different kinds of energy were changing on the bar graph the total energy stayed the same
- Creates energy bar graphs for different situations
- Gravitational potential energy is height
- Kinetic energy is speed
- Thermal energy is friction/impact
- Total energy stays the same the entire time, and in most scenarios there will be 100 J total
- Identifies the correct units of each quantity in this unit
- Energy is measured in Joules (J) or 1 J = 1 kgm²/s²
- Velocity is measured in m/s
- Kinetic energy, Gravitational potential energy, and total energy is measured in J
- Acceleration is measured in m/s²
- Height is measured in meters (m)
- Mass is measured in kg
- Can calculate using gravitational potential energy = mgh and kinetic energy = ½ mv² to solve for any variable after reading the problem and plugging information into the equation to solve
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