Podcast
Questions and Answers
A spring with a spring constant of $k$ is stretched by a distance $x$. What does the term 'limit of proportionality' refer to?
A spring with a spring constant of $k$ is stretched by a distance $x$. What does the term 'limit of proportionality' refer to?
- The minimum extension required to observe elastic behavior.
- The maximum force that can be applied to the spring.
- The point at which the spring's potential energy is maximized.
- The point beyond which the spring becomes permanently deformed, and Hooke's Law no longer applies. (correct)
According to the principle of conservation of energy, the total energy in a closed system always increases over time.
According to the principle of conservation of energy, the total energy in a closed system always increases over time.
False (B)
Describe qualitatively how the pressure beneath the surface of a liquid changes with depth and density.
Describe qualitatively how the pressure beneath the surface of a liquid changes with depth and density.
Pressure increases with depth and density of the liquid.
The equation for kinetic energy is $E_k = 1/2 * m * ______^2$
The equation for kinetic energy is $E_k = 1/2 * m * ______^2$
Match the energy storage method with the corresponding resource:
Match the energy storage method with the corresponding resource:
Which of the following is the correct formula for calculating efficiency?
Which of the following is the correct formula for calculating efficiency?
Mechanical work done is equal to the energy destroyed during the process.
Mechanical work done is equal to the energy destroyed during the process.
State the equation that relates power to work done per unit time.
State the equation that relates power to work done per unit time.
The equation that represents the relationship between force, displacement, and work done is $W = ______ * d = \Delta E$
The equation that represents the relationship between force, displacement, and work done is $W = ______ * d = \Delta E$
Which energy resource is NOT primarily derived from radiation from the Sun?
Which energy resource is NOT primarily derived from radiation from the Sun?
Flashcards
Spring Constant
Spring Constant
The force per unit extension of a spring.
Limit of Proportionality
Limit of Proportionality
The point beyond which a spring no longer returns to its original length when the force is removed.
Pressure
Pressure
Force acting perpendicularly per unit area.
Kinetic Energy
Kinetic Energy
Signup and view all the flashcards
Conservation of Energy
Conservation of Energy
Signup and view all the flashcards
Efficiency
Efficiency
Signup and view all the flashcards
Solar energy
Solar energy
Signup and view all the flashcards
Nuclear energy.
Nuclear energy.
Signup and view all the flashcards
Work
Work
Signup and view all the flashcards
Power
Power
Signup and view all the flashcards
Study Notes
- AY2024-2025 Detailed KPIs for T2-EoT Exam Physics – PHY41
Stretched Springs
- Load-extension graphs for an elastic solid need to be sketched, plotted, and interpreted and the associated experimental procedures need to be described.
- Spring constant is defined as force per unit extension, and the equation k = F/x is used.
- 'Limit of proportionality' is defined and used for a load-extension graph and this point is identified on the graph.
Pressure
- Pressure is defined as force per unit area; the equation p = F/A is used.
- Pressure varies with force and area in everyday examples.
- Pressure beneath the surface of a liquid changes with depth and density of the liquid.
Energy
- Energy may be stored as kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic and internal (thermal).
- Energy is transferred between stores during events and processes, including transfer by forces (mechanical work done), electrical current.
- The equation for kinetic energy Ek=1/2 mv² is used.
Conservation of Energy
- The principle of the conservation of energy is applied to simple examples including the interpretation of simple flow diagrams.
- The principle of the conservation of energy is applied to complex examples involving multiple stages, including the interpretation of Sankey diagrams.
- Efficiency is defined as (%) efficiency = (useful energy output)/ (total energy input) (× 100%) and (%) efficiency = (useful power output)/ (total power input) (× 100%).
Energy Resources
- Useful energy may be obtained, or electrical power generated, from: chemical energy stored in fossil fuels, chemical energy stored in biofuels, water (including energy stored in waves, tides, and hydroelectric dams), geothermal resources, nuclear fuel, light from the Sun (solar cells), infrared and other electromagnetic waves from the Sun (solar panels) and be the source of wind energy (including references to a boiler, turbine and generator).
- Advantages and disadvantages of each method are covered in terms of renewability, availability, reliability, scale and environmental impact.
- Radiation from the Sun is the main source of energy for all energy resources except geothermal, nuclear and tidal.
- Energy is released by nuclear fusion in the Sun.
Work
- Mechanical or electrical work done is equal to energy transferred.
- The equation for mechanical working is W = Fd = ΔΕ.
Power
- Power is defined as work done per unit time and also as energy transferred per unit time; with equations P = W/t and P = ΔΕ/t.
States of Matter
- The distinguishing properties of solids, liquids and gases are known.
- The terms for the changes in state between solids, liquids and gases are known (gas to solid and solid to gas transfers are not required).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
