Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
Force |
A push or pull on an object that can cause it to change motion. |
|
|
Gravity |
The force that pulls two objects toward one another because of their mass, such as toward the center of the earth. |
|
|
Gravity and the moon |
An object weighs 1/6 as much on the moon as on the earth because the moon has less gravity than Earth. |
|
|
Friction |
A force that slows down or stops moving objects such as a soccer ball in motion. Friction occurs when two objects rub against each other like a bike's brakes against the tires. |
|
|
Potential energy |
Energy that an object has because of position, for example, a child sitting at the top of a slide. |
|
|
Kinetic energy |
Energy of motion (potential energy changes to kinetic energy when movement begins as when the child actually slides down the slide). |
|
|
Chemical energy |
Energy that comes form chemical changes in batteries, gasoline, or the foods you eat. |
|
|
Work |
The result of a force moving an object. If there is no movement, there is no work. If you are lifting or moving a heavier object, you are doing more work than if you are lifting or moving a lighter object the same distance. |
|
|
Simple Machines |
Machines made of only one or two parts. They make work easier. |
|
|
Wedge |
A simple machine that has slanted sides such as a nail or knife. |
|
|
Inclined Plane |
A simple machine with a flat surface and one end higher than the other, such as a ramp. |
|
|
Compound Machine |
A machine made up of two or more simple machines. |
|
|
Complex Machine |
A machine made of many simple and compound machines. Most of them are run by electricity or fuels. |
