Physics · Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power
Identify the energy changes in the following two cases - car moving up a hill B
Identify the energy changes in the following two cases - \( A: A \) car moving up a hill B : Photographic film is exposed to sun- light
- A. In 'A' mechanical energy in moving car is converted to potential energy and in 'B' potential energy is converted to chemical energy
- B. In'A' potential energy in moving car is converted to kinetic energy and in 'B' chemical energy is converted to light energy.
- C. In'A' kinetic energy in moving car is converted to potential energy and in 'B' potential energy is converted to light energy.
- D. In'A' kinetic energy is moving car is converted to potential energy and in 'B' light energy is converted to chemical energy.
Step-by-step solution
For a car moving up a hill, its kinetic energy decreases as it gains gravitational potential energy, so kinetic energy converts to potential energy. For photographic film exposed to sunlight, light energy from the sun causes a chemical change, converting light energy into chemical energy stored in the film.
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