physics chapter 10

Satellite

A projectile or celestial body orbiting around a larger celestial body.

Explain how a satellite falls around earth?

If a satellite moves at 8 km per second then it will drop 5 meters per second, it matches earths curvature. If it travels 9 or 10 km per second then it travels in elliptical.

What did Kepler discover about the periods of planets and their distances from the sun?

That the period squared is proportional to the radial distance cubed.

Why doesn't the force of gravity change the speed of a satellite in a circular orbit?

The force of gravity acting on the satellite does not change bc the distance between the satellite and earth always stays the same therefore it does not change.

why do the vertical components of velocity change with time and the horizontal components of velocity doesn't?

The vertical components of velocity change with time because it is either moving with or against gravity and it either increases or decreases depending on which direction it is going. However the horizontal components of gravity doesn't change with time because there is no force acting on it.

Parabola

a curved path followed by a projectile only under the influence of gravity.

projectile

any object traveling through air or space only under the influence of gravity.

In Newtons thinking?

he realized the planets were being pulled towards the sun.

What was the direction of the force on a planet in kepler's thinking?

he thought planets were being pulled along their orbit.

Escape speed

the minimum speed needed to "break free" from gravity's attraction.

Keplers law

the path of the planet around the sun in an ellipse with he sun at the focus.