Grade 12 Physics: Mechanical Energy
This worksheet covers fundamental concepts of mechanical energy, including kinetic energy, potential energy, and their conservation, suitable for Grade 12 physics students.
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Grade 12 Physics: Mechanical Energy
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Read each question carefully and provide your best answer. Show all your work for calculations.
1. Which of the following is the correct definition of mechanical energy?
The energy an object possesses due to its motion.
The sum of kinetic and potential energy.
The energy stored in an object due to its position or state.
The energy transferred due to a temperature difference.
2. A 2 kg ball is dropped from a height of 10 meters. What is its potential energy just before it is dropped? (g = 9.8 m/s²)
20 J
196 J
98 J
10 J
3. The principle of conservation of mechanical energy states that in an isolated system, the total mechanical energy (kinetic plus potential) remains .
4. Kinetic energy is directly proportional to the mass of an object and the square of its .
5. Mechanical energy is always conserved, even when non-conservative forces like friction are present.
True
False
6. A roller coaster car starts from rest at the top of a hill 40 meters high. Assuming no friction, calculate its speed at the bottom of the hill. (g = 9.8 m/s²)
7. Observe the energy pyramid diagram below. In the context of mechanical energy, where would potential energy be highest and lowest?
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