Gravity

of the pull of gravity

Mass is a measure of the amount of matter that an object contains, whereas weight is the measurement _______ on an object.

sun

The ______ is the most massive object in our solar system, and the planets' gravitational attraction to it keeps them in orbit around it.

more gravity

The closer and more massive an object is, the _______ will be felt from that object.

gravity

The force that keeps satellites in orbit around Earth is:

masses

The gravitational attraction between two objects depends on the distance between the objects and their _________.

Earth

The gravity of _______ influences the moon and other less massive objects around it.

Gravity is a force that causes matter to be attracted to other matter. Gravity is a relatively weak force compared with other forces, such as electricity and magnetism. The larger the mass of an object, the greater its gravitational pull on another object.

What is gravity?

The rocket's thrust must overcome Earth's gravity.

What must happen in order to successfully launch a rocket from the surface of the Earth into outer space?

the moon's mass is less than the Earth's mass

When the Apollo astronauts went to the moon they weighed about one-sixth of what they weighed on Earth because _______.

Acceleration

a change in the velocity (speed, direction, or both) of a body (related word: accelerate).

Gravity

a force that exists between any two objects that have mass

Force

a pull or push that is applied to an object

Simple Machine

a simple device without moving parts that changes the magnitude or direction of a force

Pulley

a simple machine consisting of a rope that is wrapped around a wheel; can be used to help lift heavy objects

Pendulum

a string or bar that is loose at one end but fixed at the other and can rotate or swing around the fixed point

Inertia

an object's resistance to a change in motion

Hydroelectric power

electrical power produced by falling water that turns a turbine generator

Action

movement; something that happens

Mass

the amount of matter in an object

Weathering

the breaking down of rock into smaller pieces by the action of wind, rain, and temperature change

Orbit

the circular path of an object as it revolves around another object

Gravitation

the force of attraction between two masses

Weight

the force of gravity on an object.

Tides

the rise and fall of the ocean's surface levels due to the gravitational pull of the sun and moon

Earth's gravity pulls the stone downward.

A stone is attached to a spring balance. The stone pulls the spring of the balance downward because:

different

An object on Earth and that same object on Mars will have the same mass, but their weights will be ________ because Earth and Mars have different surface gravities.

gravitational force

As explained by Isaac Newton, a _______ exists between any two objects in the universe.

planets and stars

Gravity also causes celestial objects such as _________ to be formed from small pieces of space dust.

The astronaut would weigh more on Jupiter than on Earth.

Jupiter is much more massive than Earth. What would happen to an astronaut on Jupiter?

invisible force

Gravity is an _______ that attracts objects toward one another.

The force of gravity acting on an object on Earth determines the weight of the object. Earth's gravity pulls masses near its surface towards the center of the Earth. The gravity of the sun causes the Earth and other planets to orbit around it. The farther away two objects are from each other, the weaker the force of gravity between them.

How does the force of gravity affect objects on Earth and in our Solar System?

The comet would not be affected.

How would a rocket's path affect the path of a small comet?

at the same time

If a feather and a brick are dropped in a vacuum chamber at the same time, they will hit the ground __________.

Each planet has a different mass.

If you were to travel to several other planets in our solar system, you would find that your weight would be different on each planet. Why?

away from each other

Two airplanes are flying in the sky in such a way that the gravitational attractions between them decreases. They planes must be flying: