U1L2 Gravity and Friction

The earth gravitational force pulls all masses down at a rate of…

Gravity is why objects have ______.

If there is no gravity, objects would be ________.

Mass and weight are _____ the same thing.

Mass is an amount of_____ an object has and stays the ____ (constant) no matter what planet you are on.

When you go to the moon, their mass stays the ____.

Their weight is ___ on the moon.

Moon’s gravitational pull is ___ that of the Earth’s gravitational pull.

On Jupiter, objects will weigh ____ then earth’s gravity.

Jupiter is __ times stronger than Earth.

Mass is measured in ______ or _____

Weight is a force so weight is measured in _____

Mass is determined directly with a ______

Weight’s formula

F=____

m=_____

a=_______

Objects with more mass exert _____ gravitational pull

As the distance between two objects increases, the forces of gravity ______

If the sun has a powerful gravitational pull then why hasn’t the sun pulled us of earth yet?

What causes the planets to orbit around the sun?

What causes the moon to orbit the earth?

What pulls on our oceans and cause the tides?

Mass _____ _____on gravity

Weight _______ on gravity

Mass ____ constant no matter where you go in the universe.

Weight ______ _____ constant if you go to other places in the universe

The rate at which an object falls on earth depends on the ______ ___ of the object

Friction with air is called

On the moon, all objects fall at the same rate because there is no ___ on the moon

What force causes all falling objects to accelerate as they fell?

On earth, objects with more surface area will fall _____ because they have more friction with the air.

If there is no air resistance and gravity was the only force acting on a falling object, the falling object would never _______.

When the upward force of air resistance _____ the downward force of _____, the object will no longer pick up speed and the velocity of the object will remain _______ for the rest of the fall and this is called _______ velocity

Around 400 BC, Aristotle believed that objects with more mass would fall faster because they were heavier. In the 1600’s, Galilee Galileo proved him wrong by dropping cannonballs of different masses from the leaning Tower of Pisa and everyone was surprised that they hit the ground at the _____ time!