Friction
Solar system
The moon
Key words
100
Which surface has the most friction?
100
How long does it take the Earth to spin once? 
1 day.
100
How long does it take for the Moon to orbit the Earth?
29 days/ about one month
100
True or False, which one means right √, which one means wrong ×?
True √
False ×
200
Which surface has the least friction? why?
200
How long does it take for the Earth to orbit the Sun?
1 year.
200
What is the shape of the moon?
Sphere
200
Which picture shows us a push? and which picture shows us a pull?
P1: pull
P2: push
300
Please label the direction of the friction and the gravity
Friction going left, Gravity going down
300
How many planet do we have in the solar system?
8 planet
300
Why the moon is sphere?
Because of gravity.
300
A path that something in space takes as it goes around something else.
Orbit
400
Please label the direction of pulling force, friction and gravity
pulling force going left, friction going right, gravity going down
400
Which is the biggest planet? Which is the smallest planet?
Jupiter and Mercury
400
The moon has lots of _______ on its surface.
Craters
400
a smaller or bigger model version of a real object.
Scale model
500
What is friction?
Friction is a force that happens when two things rub against each other. It slows things down or stops them from moving.
500
The sun is not a planet, it is a ____?
Star
500
Why does the Moon have many craters, but the Earth does not?
Because of atmosphere
500
What is the relationship between the size of an object and its gravity?
The more mass an object has, the stronger the gravity.