#7 Gravity (QUIZS)

What does NASA like to call the free-fall condition while on the space station?

• microgravity
• microweight
• microdensity
• micromass

You can think of it as "how much stuff makes up an object"

• size
• brightness
• mass
• density

Isaac Newton and this scientist both explored gravity using math.

• Tycho Brahe
• Robert Hooke
• Galileo Galilei
• Johannes Kepler

Gravity from an object _____

• stops at it's surface
• stops after about 10,000 km
• stops at the edge of the solar system
• goes on forever

When the distance from an object is doubled, the force of gravity drops by a factor of _____

• 2
• 4
• 10
• 16

Which particle has no mass, yet can be affected by gravity?

• proton
• electron
• neutron
• photon

A rock thrown hard enough sideways will orbit the Earth once every _____

• 9 minutes
• 90 minutes
• 9 hours
• 90 hours

In order to break free of a planet's gravity, an object must be moving faster than the _____

• escape velocity
• getaway acceleration
• break-away pace
• liberation altitude

The planets of our solar system have orbits that are _____

• circular
• ellipses
• parabolas
• hyperbolas

What can be described as "falling and missing the ground"?

• accelerating
• free-falling
• orbiting
• attaining escape velocity