Chapter 4 test; "Work and energy"
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Created by:
alexisskye on April 24, 2012
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33 terms
Terms | Definitions |
|---|---|
 Energy does not have to involve motion | True |
| Energy is the ability to cause a change | True |
| Energy is the ability to cause change | True |
| when you ride a playground sing, your potential energy is greatest at the highest point | True |
| Chemical energy travels from the sun to Earth and is transformed into light energy by plants | False |
| As mass decreases. kinetic energy increases | False |
| Lowering an object decreases its potential energy | True |
| In a car engine, buring fuel produses heat. which causes gases to expand. producing kinetic energy | False |
| The sum of potential and kinetic energy in a system is called the total energy | False |
| As an object falls its potential energy is lost to the air around it | True |
| Carbohydrates and fats provide our bodies with energy in the form of calories | True |
| Energy from the sun and energy from food are just different forms of the same thing | True |
| Under certain conditions it is possible to get more work out of a machine than you put into it | True |
| Some machines do not multiply the force that is applied to them | True |
| In order for qork to be done on an object the object must move | True |
| Power equals work myltiplied by time | False |
| Mechandical advantage is always greater than 1 | False |
| Energy cannot be changed from one variety to another | False |
| Gravitational potential energy is proportional to both mass and height above a reference lever | True |
| A stretched bow and a compressed rubber ball both possess elastic potential energy | True |
| The kinetic energy of an object increases as its ___ increases | Mass |
| Invresing the speed of an object __ Its potential energy | Decreases |
| The SI unit for energy is the ____ | Joule |
| You can calculate kinetic energy by using the equasion | M*V2 / 2 |
| You can calculate gravitational potential energy by using the equasion ____ | MH.8 m/s2 |
| A bus engine transgers chemical potential energy into ____ so that the bus moves | Kinetic energy |
| According to the law of conservation on energy, the total amount of energy in the universe ____________ | Does not change |
| A device that does work with only one movement and changes the suze or direction of a force is a ____ | Machine |
| The amount by which a machine multiplies an effort force is called the ______ | Mechanical energy |
| When two or more simple machines work together, they are called _________ | Compound machine |
| Unit of power is the _____ | Watt |
| Machines make tasks easier by changing either the magnitude or the direction of the _______ needed | Force |
| At what point is a rollercoasters GPE the lowest? | Closest to the ground |
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