the curvature of the Earth.

The path of an Earth satellite follows...

a projectile moving fast enough to fall continually around Earth rather than into it.

satellite

8,000 m/sec

Earth's orbital speed

always moving perpendicular to gravity and parallel to Earth's surface at a constant speed

circular orbit

time for a complete orbit

For satellites close to earth this is 90 minutes.

For satellites close to earth this is 90 minutes.

period

two fixed points in an ellipse

foci

a satellite in orbit around Earth that traces an oval shaped path

elliptical orbit

The sum of the KE and PE of a satellite is constant at all points along an orbit.

Energy conservation

point in a satellite's orbit farthest from the center of the Earth

apogee

the point in a satellite's orbit closest to the center of the Earth

perigee

the minimum speed necessary for an object to escape permanently from a gravitational field that holds it.

Earth: 11.2 km/sec

Earth: 11.2 km/sec

escape speed

be above Earth's atmosphere.

satellites orbit at least 150 km above the surface of the Earth to....

elliptical

The force of gravity does work on a satellite in an __________ orbit.

Total energy

What remains constant for a satellite in elliptical orbit?