List six different forms of energy and give a real-world example of each (e.g., kinetic, gravitational potential, elastic, thermal, chemical, electrical, nuclear, sound, radiant).
Q2 ā Units of energy
State the SI unit for energy and give one alternative everyday unit (used on hydro bills). State the relationship between them. (Hint: kWh)
Q3 ā Calculation prereq
A 5.0-kg object moves at \(4.0\) m/s. (a) Calculate its kinetic energy. (b) If it is lifted to a height of \(2.0\) m, what is its gravitational potential energy?
Q4 ā Energy transformations (concept)
For a child swinging on a swing, identify the points of (a) maximum kinetic energy, (b) maximum gravitational potential energy. Then describe one full back-and-forth in terms of energy conversions.
Q5 ā Conservation (multiple choice)
A roller coaster car at the top of a frictionless hill has \(80\) kJ of gravitational potential energy and 0 kinetic energy. At the bottom of the hill, ignoring friction:
Q6 ā Heat (concept review)
Explain (in 2ā3 sentences) why a metal spoon feels colder to the touch than a plastic spoon at the same temperature. Use the term "thermal conductivity".
Q7 ā STSE
Why is energy conservation (e.g., LED bulbs, building insulation) considered "the cleanest source of energy"? Suggest two ways your household could reduce energy use.