Working 9 to 5!
A student lifts a 20 N book 2 meters. How much work is done?
40 Joules
Give one real-world energy transformation.
Mr.Caudill's discretion :)
Which direction does heat travel?
From warmer to cooler
Define frequency.
The number of wave cycles that pass a point per second (Hertz)
What is the word equation for photosynthesis.
Carbon dioxide + Water + Sunlight → Glucose + Oxygen.
If 30 J of work is done in 2 s, what’s the power?
15 Watts
Why do moving objects lose mechanical energy over time?
Because of friction, some energy transforms into heat, sound, or other non-useful forms.
Name the 3 types of heat transfer.
Conduction, Convection, and Radiation
Define reflection and refraction
Reflection: The bouncing of light, sound, or other waves off a surface.
Refraction: The bending of a wave as it passes between substances of different densities.
What is the word equation for cellular respiration.
Glucose + Oxygen → Carbon dioxide + Water + Energy (ATP).
Explain why increasing power doesn’t always increase total work.
Power measures the rate of work, not total work. Doing the same work faster raises power but not total energy output.
When you lift an object, which energy increases?
Gravitational potential energy.
How does insulation affect heat flow?
It slows down heat transfer.
Compare wavelength, frequency, and energy.
Short wavelength = high frequency = high energy. Long wavelength = low energy.
How does photosynthesis and cellular respiration form a cycle?
Photosynthesis makes oxygen and glucose; respiration uses them and returns CO₂ and H₂O.
Compare the effect of increasing time vs. distance on power.
Increasing time decreases power.
Increasing distance increases power.
Where is Potential Energy and Kinetic Energy at it's maximum?
Potential Energy: Highest Point
Kinetic Energy: Lowest Point
Why can’t convection occur in solids?
Particles in solids can’t move freely; they only vibrate.
State the Electromagnetic spectrum from longest wavelength to shortest wavelength
Radio, Microwave, Infrared, Visible, Ultraviolet, X-Ray, Gamma
Explain how energy moves through producers and consumers.
Plants capture radiant energy and convert it to glucose; animals consume glucose and release energy via respiration.
How can a machine make work easier?
It changes the amount or direction of force, reducing effort though total work stays constant.
Explain why removing friction would change, but not create, energy
Friction converts some energy into heat; without it, energy remains mechanical but total energy is unchanged (still conserved).
Explain how the 2nd Law of Thermodynamics (Law of Conservation of Heat) relates to heat flow.
Heat naturally flows from high to low temperatures until equilibrium has been achieved
Explain one real-world use of wave behavior.
Fiber optics use total internal reflection to transmit data; medical imaging uses ultrasound reflection.
What happens if sunlight is reduced for months.
Photosynthesis slows → less oxygen → less glucose → respiration and ecosystems decline.