Presentation on theme: "TOPIC: Energy AIM: Describe potential and kinetic energy and conversions that can occur between these two forms of energy. Do Now: Take out HW ditto Top."— Presentation transcript:
1 TOPIC: EnergyAIM: Describe potential and kinetic energy and conversions that can occur between these two forms of energy.Do Now: Take out HW dittoTop of the Ditto on the back of yesterday’s notes.HW: Bottom of Physical and Chemical Properties Review DittoChemistry Castle Learning due on Tuesday!
3 Law ofConservationof EnergyEnergy cannot be created or destroyed, only changed from one form to another
4 Think of energy as money. $100 can be saved in many forms… Cash in your wallet, a bank account, travelers’ checks, gold or silver coins…Money can be transferred to different forms.It can be deposited in a bank account, or traded for gold.No matter what form, money is money…The same is true for energy. Energy from the sun and energy from food are only different forms of the same thing.
21 The ram of a pile driver has mechanical energy When held up, it has mechanical energy in the form of potential energy. As it falls, it has mechanical energy in the form of kinetic energy. As it strikes the spike, it applies a force to move the spike (it does work on it).
22 On the platform:KE = 0JPE = maxDuring the jump:KE is increasingPE is decreasingPE KEIn the water:KE = 0JPE = max
24 Let’s summarize… 1. What is energy. How is it measured. 2 Let’s summarize… 1. What is energy. How is it measured? 2. Describe the Law of Conservation of Energy. 3. Explain the difference between kinetic energy and potential energy. 4. What can cause an increase in kinetic energy? 5. Describe the relationship between height and gravitational potential energy. 6. Describe the following energy conversions: - jumping off a diving board - throwing a ball into the air
25 A high diver steps off a diving platform that is 10m above the water A high diver steps off a diving platform that is 10m above the water. If no air resistance is present, during the fall there will be a decrease in the diver’sgravitational potential energytotal mechanical energykinetic energymomentum
26 Which of the following is an example of kinetic energy? A car not movingWater falling off a damA rock resting on a ledgeA person sitting in a chair
27 Which of the following increases when a metal spring is stretched horizontally? Potential energyKinetic energyGravitational potential energyElectrical energy
28 What happens to the kinetic energy and gravitational potential energy of a ball during free fall? GPE and KE both increase.GPE and KE both decrease.GPE decreases and KE increases.GPE increases and KE decreases.
29 If both of these balls are traveling down a bowling lane at the SAME speed, which one would have more kinetic energy? Support your answer.
30 Which skier will have a greater potential energy? Support your answer.
31 At which two points on the pendulum, is the pendulum experiencing the greatest potential energy?