| A | B |
|---|
| 1st artificial satelite | Sputnik |
| year of sputnik launch | 1957 |
| country orgin | soviet union |
| mass | 84kg |
| diameter | 60cm |
| time for 1 revolution around earth | 90 minutes or and hour and a half |
| natrual satelite | Moon |
| how are most satelites out in orbit | by rockets |
| satelite tasks | get weather,military purposes,communcation |
| geostationary satelites | satelites that always stay still above a special location |
| newtons 3rd law | for every action there is an equal and oppisite reaction |
| momentum | a property of moving objects because they have mass and velocity |
| if object isn't moving | no momentum |
| momentum is based on | mass and velocity |
| law of conservation of momentum say that | total momemtum of a group of abjetcs doesn't change unless outside forces act on them |
| newtons second law | a net force acting on an object causes the object to accelerate in the direction |
| acceleration is based on | SIZE of force and MASS of the object |
| projectiles | anything thrown or shot in the air |
| rules of projectiles rule a | always follows a ueved path |
| b) | horizontal motion due to inertia |
| c) | vertical motion due to gravity |
| centripetal | to the center |
| centripeatl acceleration | acceleration towards the center of a circle |
| free fall | all orbiting objects FALL towards earth |
| weightless | you can't measure weight because you can't press against a scale |
| weightlessness problems | bones-muscles aet weak |
| air restiance | all objects fall or 9.8 m/s2 unless acted on by other forces |
| air restiance deoends on | speed size shape density |
| terminal velocity | highest speed reached by falling abjects |
