| A | B |
|---|
| Force | a push or a pull |
| Position | The location of an object |
| Motion | a change in position |
| work | movement |
| gravity | is the force that pulls objects towards each other - it is the force that pulls toward the earth |
| friction | a force that pushes against a moving object - it occurs when objects rub against each other |
| kinetic energy | energy in the form of motion |
| distance | the amount of space between two objects |
| simple machine | a machine with few or no moving parts |
| compound machine | is two or more simple machines put together |
| birds | have a beak, feathers, 2 wings, 2 lega. Birds fly, breathe air with lungs, reproduce by laying eggs, feed their young until the young can find food on their own. VERTEBRATE |
| reptiles | are vertebraes with scaly skin. Tough scales help protect them. Some reptiles live on land and some in water. All reptiles breathe through their lungs and most reproduce by laying eggs but some give birth to live young. |
| amphibians | live part in water and part on land. Frogs, toads, and salamanders are amphibians. Most amphibians start as an egg floating in water and when they hatch they look like fish and they breathe through gills. As they get older they grow legs, lungs, and begin to live on land. Vertebrate |
| fish | vertebrates that spend their whole lives in water. Fish breathe oxygen using gills and reproduce by laying eggs. Most are covered in scales and have a slimy coating. |
| mammals | vertebrates with hair or fur. They do not hatch from eggs. They are born live. Female mammals make milk to feed their young. They care for their young until the young can find food on its own. Mammals breathe with lungs. Dolphins and whales are mammals that live in water. They pull their heads out of the water to breathe. |
| Parts of a plant | roots, stem, leaves |
| Energy comes from | the food you eat. Food is a source of energy. |
| Work is being done when... | force changes an objects motion |
| A wheelchair is a simple machine | inclined plane |
| What makes brakes work? | when you squeeze the brake handles on a bike, the rubber brake pads press against the rim of the wheel and cause friction. The friction between the pads and the rim causes the bike to stop. |
| chine you use to lift a box on a truck | inclined plane and a pulley |
| Simple machine used to open a can | lever or a wedge |
| Smooth surface used | to decrease friction and increase speed on a slide |
| four basic needs of animals | food, water, gases, space (from environment) |
| 2 ways a force can affect an object | start moving, change directions, stop moving |
