Show:
Rolling Balls
Earth's Movement
Falling Objects
Standing Eggs
The Moon's Motion
100
True or False: Balls rolling on level ground never stop.
What is false?
100
A Greek astronomer named _______ said that the earth was the center of the universe and the moon, sun, stars, and planets all moved around it.
Who is Ptolemy?
100
The idea that heavier objects fall faster than lighter ones is ______ (True/False).
What is false?
100
Gravity pulls on the point of the egg that seems to be its ______.
What is center?
100
Gravity and the moon's motion work together to trap the moon in its ______.
What is orbit?
200
A rolling ball will _________________ (more than one word) upon impact.
What is change direction?
200
Copernicus figured that the universe would be a lot simpler if all the planets, including the earth, moved around the ____.
What is sun?
200
Rolling balls down a ramp can ____ them down.
What is slow?
200
This is the point that seems/is the center of an object.
What is the center of gravity?
200
If gravity suddenly disappeared, the moon would _______________________ (more than one word).
What is fly off in a straight line.
300
This is a force that occurs between two surfaces where there is a motion.
What is friction?
300
The earth travels around the sun while it ____________________ (more than one word).
What is spins like a top?
300
The same _____ makes rolling balls roll down ramps and falling balls fall.
What is force?
300
An egg's center of gravity is ______________________ (more than one word).
What is not at the center?
300
If gravity were the only force acting on the moon, it would ____________ (more than one word) the earth.
What is crash into?
400
A ball will go slower and slower until it stops for a moment, then go faster and faster when it rolls on a _______.
What is hill?
400
We don't feel the earth move because __________________________ (more than one word).
What is it is spinning at a steady rate?
400
The force that makes things fall is called ________.
What is gravity?
400
When an egg rolls onto its side, its center of gravity becomes ______.
What is lower?
400
The force that come from the moon's motion and the force toward its center is called __________________ (more than one word).
What is centrifugal force?
500
Newton's first law of motion is ______________________________________________________ (more than one word).
What is: Moving objects will move forever, and resting objects will rest forever, unless some outside force acts on them?
500
Everything on the surface of the earth is ____________________ (more than one word) the earth.
What is moving with?
500
________ discovered that no matter how heavy or light they are, all balls fall toward earth at the same rate.
Who is Galileo?
500
An object falls toward ________________________ (more than one word).
What is the center of the earth?
500
This is the word that literally means "away from the center" actually means ____________.
What is the absence of a force toward the center?