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