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Unit review: energy — Homework
Mixed review: use the correct energy formula or idea from this unit for each problem.
- 1.A 4 kg object is lifted 3 m (g = 10 m/s^2). Find its gravitational PE.
- 2.A 2 kg object moves at 6 m/s. Find its kinetic energy.
- 3.A machine is 60% efficient and receives 150 J. Find its useful output.
- 4.A ball has 40 J of PE at the top and 35 J of KE just before landing. How much was wasted, and into what form?
- 5.Explain why touching a hot burner and feeling its warmth from across the room are different heat-transfer methods.
- 6.Pick one energy idea from this unit and explain it using an example from your own home.
🌲 Homeschool of the FutureEighth Grade · Science · week 18 homework