Newton's Law of Gravitation

(p.236) High and low tides are partly due to the gravitational force exerted on earth by:

• the sun

• the moon

• Mars

• the big dipper

High tides take place at locations on earth that are nearly ​ (a)   the ​ (b)   . (p.236)

• in line with
• moon
• perpendicular to
• sun
• visible to
• on top of
• Venus
• rings around Uranus
• moons of Venus
• north star

(p.237) How did Henry Cavendish contribute to Newton's law of universal gravitation?

(p.237) Gravity is a ________ force.

• contact

• field

(p.238) What is shown in Figure 2.5 on p.238?

(p.238) Gravitational field strength equals:

• free-fall acceleration

• the acceleration due to gravity

• 9.81 m/s² on earth's surface

(p.238) True or False: Your weight changes with your location.

• true

• false

________ = mass x gravitational field strength (p.238)

• weight

• thermal energy

• height

• work

(p.238) Newton's law of universal gravitation shows that the value of earth's gravitational field strength (g) depends on ​ (a)   and ​ (b)   .

• mass
• distance
• volume
• Uranus
• Saturn
• kinetic energy
• friction
• electricity

(p.238) What happens as your distance from earth's center increases?