chapter 4 vocab

Question 1

the oval path followed by a satellite

Answer 1

ellipse

Question 2

the speed that a projectile, space probe, or similar object must reach to escape the gravitational influence of Earth or of another celestial body to which it is attracted

Answer 2

escape speed

Question 3

the intensity of an effect from a localized source spreads uniformly throughout the surrounding space and weakens with the inverse square of the distance

Answer 3

inverse-square law

Question 4

every body in the universe attracts every other body with a force the strength of which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers

Answer 4

law of universal gravitation

Question 5

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

Answer 5

parabola

Question 6

any object that moves through the air or through space under the influence of gravity

Answer 6

projectile

Question 7

a projectile or small celestial body that orbits a larger celestial body

Answer 7

satellite

Question 8

the force that an object exerts on a supporting surface (or, if suspended, on a supporting string), which is often, but not always, due to the force of gravity

Answer 8

weight

Question 9

being without a support force, as in free fall

Answer 9

weightless