1 / 12

EMM Energy Review

Practice and study guide for the test. EMM Energy Review. Lesson 1- Pre- Assessment. Energy transformations-types of energy Machines- not needed for this test Motion- not needed for this test. Lesson 2- Building a Battery. What are the parts of a battery?

monifa
Download Presentation

EMM Energy Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Practice and study guide for the test EMM Energy Review

  2. Lesson 1- Pre- Assessment • Energy transformations-types of energy • Machines- not needed for this test • Motion- not needed for this test

  3. Lesson 2- Building a Battery What are the parts of a battery? • Anode +, Cathode -, and electrolyte How does a battery work? • Chemical reaction allows flow of electrons What energy is in a battery? • Potential chemical energy

  4. Lesson 3- Rechargeable Batteries How is energy stored in a battery? • Chemical Potential Energy What energy transformations take place between a battery and a light bulb? Battery and motor? • Chemical Potential EnergyKinetic Energy Electric Energy Light/Rotational EnergyHeat Energy What are wet cell and dry cell batteries? • Wet= liquid electrolyte, Dry= Paste electrolyte

  5. Lesson 4- Storing & Using Energy How does charge time affect stored energy in a battery? • Longer charge = more stored energy, until chemical reaction is totally reversed and battery will no longer charge Which draws more energy, the light bulb or the motor? • The motor draws more because in our tests, it used the battery power quicker than the light bulb with evenly charged batteries.

  6. Lesson 5- Intro to Forces What is force: • A push or a pull What is elastic force? • The resistant force exerted that wants to return something to its original state (rubber/elastic) What is gravitational force? • The pull of objects toward a larger object (toward the center of the earth) What is frictional force? • A force that opposes motion like sliding friction or air friction.

  7. Lesson 5 - Continues Weight vs. mass? • Weight is a measure of gravitational force (we typically use spring scales). Weight changes based on gravitational pull (100N on earth would be 16.7N on the moon). • Mass is a measure of the amount of matter in an object (we always use a balance to find mass). Mass does not change (100g=100g). • Mass and weight are often the same on earth.

  8. Lesson 6- Force of Friction How does surface type affect frictional force? • Smoother surfaces typically create less friction. Rougher surfaces typically create more friction between objects. How does weight affect frictional force? • More weight was more pressure on the surface and a greater amount of friction was created. Surface area does not have a large impact of frictional force.

  9. Lesson 7- Force exerted by a motor Which battery configuration provides the best performance to a motor? Why? • Series connections have the most voltage because the voltage of each battery is added to the total. This creates more force from the motor, but if one connection fails, they all do. • Parallel connections do not increase voltage so performance is low. However, they are reliable and work even if one cell fails. • Hybrid connections can be the best of both.

  10. Lesson 8- Work and the motor If energy is the ability to do work, what is work to a scientist? • Work happens when a force (Newton) is applied to an object and it moves a measurable distance (meter). W=F x D.

  11. Lesson 9- Power of a motor Power is the rate at which work is done. How do scientists calculate power? • Scientists use the formula: Power=Work/time • Power is known as a Watt, or 1Nm/sec. If it takes 45 Joules and 5 seconds for Mr. Jez to move a box, how many Watts were used? • ??? • P=W/t P=45/5 = 9Joules/sec., or 9 Watts

  12. The End • Keep studying and get smart!

More Related