Gravity
Friction
Climbing Frog
English Words
Random
100
Who is this person?
Isaac Newton/牛顿
100
Give one example of something that can increase friction.
Select one from:
More pressure, increased surface area, rougher surface.
100
Which string moves?
The straight one / Left one
100
What is gravity?
万有引力/地心引力
100
Can there be friction between objects that are not touching?
No
200
Which direction does gravity apply on an object on Earth?
Downward / towards the center of the Earth
200
Describe one problem in a world with no friction.
Teacher decides. An example is: it will be difficult to walk.
200
What materials did we use.
Scissors, tape, coloured paper, straws, and a string
200
What is friction?
摩擦力
200
Choose the best response.
Friction can also produce:
A) Light
B) Electricity
C) Food
D) Heat
D) Heat
300
What is 弹珠 in English?
Marble
300
What is friction:
A) A unit of a measurement
B) A force
C) A climbing frog
D) The surface area between two touching objects
B) A force
300
Why is there more friction between the slant string and the straw?
More pressure force between them.
300
What is force?
力
300
How do you know there is gravity between Earth and Sun?
Because the Earth goes around the sun, without gravity, Earth will travel away.
400
Give one thing you observed when doing the marble roller coaster?
Teacher decides.
Examples are:
The higher the starting point is, the faster the ball goes. The ball cannot go to a point higher than it's starting height.
400
Why is it hard to separate two books where many pages are interleaved?
Mainly due to increased surface area.
400
How does the frog move up?
There is a difference in the friction between the string and each straw. The side with less friction allows the frog to move up while the other side stays put. This decreases the length of the string above the frog.
400
What is the term for 过山车？
roller coaster
400
What is the English word for 观察， 科学报告上。
Observation
500
Give 3 methods gravity can be used.
Numerous sports, slides, roller coasters, etc. Teacher decides.
500
What are two ways to reduce friction?
Select two from:
Applying less force between the objects
Apply oil or lubricant to reduce the roughness
Decrease the surface area
500
Why is it important your hand not move up with the string?
Otherwise, you could move the frog by pulling only one of the strings. The point is to show that you can move the frog up very high, even beyond a human's reach.
500
What is the word for 粗糙？
rough
500
Which of the following does not affect friction between two touching objects?
A) The pressure between them.
B) The surface area of contact.
C) The relative speed between them.
D) The roughness of the surface of contact.
C) The relative speed between them.