| A | B |
|---|
| force | a push or pull on an object that can cause it to change motion |
| gravity | a force that pulls any two objects toward one another, such as you toward the center of the earth |
| inertia | the tendency of a moving object to stay in motion or a resting object to stay at rest |
| friction | a force that slows the motion of moving objects |
| energy | the ability to do work |
| potential energy | energy that an object has because of position |
| kinetic energy | energy of motion |
| mechanical energy | kind of energy an object has because it can move or because it is moving |
| chemical energy | energy that comes from chemical changes |
| electrical energy | energy that comes from a flow of electricity |
| work | the result of a force moving an object |
| simple machine | a machine made up of one or two parts |
| compound machine | a machine made up or 2 or more simple machines |
| complex machine | a machine made of many simple and compound machines |
| Can an object have both kinetic and potential energy at the same time? | yes |
| Give an example of potential and kinetic energy at the same time. | sliding down a slide, swinging on a swing or glider |
| Can work be done when an object does not move? | No |
| What does the amount of work depend on? | The amount of work done depends on the amount of force used and the distance that the object moves. |
| What is the work formula? | Work = force x distance |
| Be able to name examples of simple machines. | inclined plane (ramp), wheel and axle (wheelbarrow), wedge (nail), lever (screwdriver), pulley (rope and wheel), and screw |
| Be able to give examples of compound machines. | bike and pizza cutter |
| Be able to give examples of complex machines. | cars, motorcycles, robots |
| Do all objects have force? | yes |
| Can gravity be measured? | yes |
| Give an example of gravity. | throwing a ball in the air and it comes back |
| Give an example of force. | someone kicks a ball which is not moving |
| Give an example of friction. | applying brakes on in-line skates |
| How is a pulley useful? | A pulley uses a rope and a wheel to make heavy loads easier to lift. |
