Advanced/Notes 6.3
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This document discusses kinetic energy and the work-energy principle. It defines kinetic energy as the energy of moving objects and notes that it is measured in joules. Kinetic energy is proportional to mass and the square of velocity. The work-energy principle states that the net work done on an object equals its change in kinetic energy. An example problem calculates the kinetic energy and net work done to throw a baseball from rest to a speed of 25 m/s. Another example finds the net work required to accelerate a car from 20 m/s to 30 m/s. Homework problems are assigned from page 162, problems 15-25.
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Advanced/Notes 6.3
- 1. Section 6.3 Kinetic Energy Work-Energy Principle
- 2. Kinetic Energy How can I calculate the kinetic energy? How do I apply the Work-Energy Principle?
- 3. Kinetic Energy Energy is typically defined as the ability to do work Now we will only talk about mechanical energy Kinetic means moving, so we are talking about the energy during movement
- 7. Measuring Kinetic Energy Since work and kinetic energy can be equated Kinetic energy is measured in joules KE is proportional to mass KE is proportional to the square of velocity
- 8. Work Done?
- 9. Example A 145 kg baseball is thrown so that is acquires a speed of 25 m/s. (a) What is its kinetic energy? (b) What was the net work done on the ball to make it reach this speed, if it started from rest?
- 10. Example How much net work is required to accelerate a 1000 kg car from 20 m/s to 30 m/s?
- 11. Homework Page 162 # 15 - 25