Gravity - 8
_____ is strong enough to balance gravitational pulls and prevent changes in motion
Friction
This means that Earth's gravity _____ all objects in the same way
accelerates
Sometimes, objects experience _____ resistance - if you take this away, all objects would fall with the same acceleration
air
Law of Universal Gravitation: All objects ______ each other through gravitational force. Strength of the force depends on masses involved and distance between them.
attract
Gravity is the force of ______ between objects due to their mass.
attraction
Objects with greater mass have more _____ between them
attraction
Earth's gravity pulls, but doesn't push, so it's called an ______ force
attractive
Moon has ____ ____ than Earth - the force of each step pushes an astronaut higher than on Earth.
less mass
All matter has _____.
mass
Force of gravity between Earth and an object = the ______ of the object (m) x factor due to gravity (g) —> F = mg
mass
A cow has more mass than a cat, there is ____ ____ between Earth and cow
more attraction
Gravity is a ____-______ force that acts between two objects at any distance apart
non contact
Force of gravity between Earth and an ______ = the mass of the object (m) x factor due to gravity (g) —> F = mg
object
An object is in _____ when it travels around another object in space
orbit
Gravity is not a very _____ force - we overcome the attraction of Earth's entire mass on our bodies each time we stand
powerful
A skydiver is far above the ground, but Earth's gravity acts to _____ the skydiver downward
pull
Gravity is a _____ of mass, so all matter is affected by gravity.
result
When gravity is the only force affecting the fall, light and heavy objects hit the ground at the _____ _____.
same time
The gravitational forces between these objects are too ____ to pull into a pile
small
If you weigh 100 pounds on Earth, you would weigh ______ pounds on the moon.
17
On Earth, g is about _____ m/s^2. The units are the same as the units for acceleration!
9.8
You ______ feel sun's gravity since it is so far away.
cannot
Earth's gravity pulls everything toward Earth's _______.
center
The combination of forward motion and _____ motion (due to gravity) cause orbiting
downward
Force of gravity between Earth and an object = the mass of the object (m) x _____ due to gravity (g) —> F = mg
factor
You drop a 20 lb weight and a pen at the same time - all objects _____ at the same acceleration
fall
A spacecraft in orbit is always falling, but never hits the ground due to forward motion - ____ ____ of Earth
follows curve
A satellite orbits Earth as it moves _____. It is also in free fall
forward
When something is in ____ ____, gravity is pulling it down and no other forces are acting on it
free fall
Every object exerts a _____ pull on every other object - pencil, Nike shoes, books, chairs.
gravitational
Gravitational force between two objects ______ as distance between their centers decreases.
increases
The gravitational force between two objects _____ with the mass of each object.
increases
When two objects move closer, attraction between them ______.
increases
Objects further apart have ______ attractions than objects close together
weaker
