39 颗豆豆
1. 单选题
10 秒
What is the unit of force?
kg
m/s
Newton (N)
m/s^2
2. 单选题
20 秒
What is force?
A pull or push that acts on an object
the location of an object
a poo-poo on an object
the change of velocity per change in time
3. 单选题
20 秒
What is friction?
a force of eating
a force of attraction
a force that opposes the motion of one object moving past another
how fast an object's position changes over time
4. 单选题
10 秒
Under what condition can friction exist?
When two objects are touching
When two objects are sleeping
When two objects are singing
When two objects are drinking
5. 单选题
20 秒
What is gravity? 万有引力，地心吸力
The force of running
The force of playing trumpet
The force of eating
The force of attraction between two objects with mass
6. 单选题
20 秒
What two VARIABLES does Gravity depend on? How?
1) Mass (directly proportional), 2) Time (directly proportional)
1) Mass (directly proportional), 2) Distance (inversely proportional)
1) Mass (inversely proportional), 2) Distance (directly proportional)
1) Distance (directly proportional), 2) Time (inversely proportional)
7. 单选题
20 秒
Is Alice fat?
Yes
No
Absolutely Yes
Not sure
8. 单选题
10 秒
Who is Newton?
Newton is the one who developed the Newton's Three Laws of Motion.
Newton is a movie star.
Newton is a Chinese teacher.
Newton is the author of Harry Potter.
9. 单选题
20 秒
What does Newton's First Law state?
Force = mass x acceleration (F = m * a).
For every Action (force), there is an equal and opposite Reaction (force).
Object in motion tends to stay in motion, at rest tends to stay at rest, unless adding unbalanced force.
It states that all objects cannot move forever, no matter what.
10. 单选题
20 秒
What is the other name of Newton's First Law?
Law of Inertia 惯性
Law of Laughter
Law of Action vs Reaction
Law of F = M x A
11. 单选题
10 秒
What is balanced force?
Forces that are equal in size and opposite in direction, cancel each other out
Forces that cause a change in motion
All of the above
None of the above
12. 单选题
20 秒
What is unbalanced force?
Forces on object equal in size and opposite in direction, canceling each other out
Forces of attraction between two objects in mass
Forces that can cause a change in motion.
Forces that are balanced
13. 单选题
20 秒
What is inertia 惯性？
A change in an object's position.
The location of an object.
The tendency of walking.
The tendency of an object to resist a change in its state of motion.
14. 单选题
20 秒
What is an example of inertia?
If don't wear seatbelt and when car's velocity changes, human body will keep moving in a same direction.
The falling of an apple from the tree.
Moving from Shanghai to Hong Kong.
Class 5(3) flying in the sky.
15. 单选题
20 秒
What is velocity?
SPEED of a moving object + DIRECTION of the object travel
SPEED of a moving object + MASS of the object
MASS of the object + DIRECTION of travel
COLOR of the object + DIRECTION of travel
16. 单选题
20 秒
What two variables affect Inertia 惯性？
Mass (directly proportional), Velocity (inversely proportional)
Mass (directly proportional), Velocity (directly proportional)
Mass (inversely proportional), Velocity (inversely proportional)
Mass (inversely proportional), Velocity (directly proportional)
17. 单选题
10 秒
If objects have inertia, why don't objects in motion continue to stay in motion forever?
Because there is always a force to slow down the object (gravity or friction)
Because they are in bad mood
Because someone is controlling them
Because they are angry.
18. 单选题
20 秒
Which of the following equation of speed is NOT correct?
Distance = Speed x Time
Speed = Distance / Time
Time = Distance / Speed
Speed = Distance x Time
19. 单选题
20 秒
What are the two ways that an object's velocity can change?
Change in Mass + Change in Speed
Change in Speed + Change in Direction
Change in Direction + Change in Color
Change in Speed + Change in Size
20. 单选题
20 秒
What is Acceleration 加速 and Deceleration 减速 relate to?
Weight
Velocity
Height
Color
21. 单选题
20 秒
What happen if Alice and Lydia accelerate their running from classroom to the lunch canteen after class?
They will arrive at the canteen much earlier and eat earlier.
They will arrive at the canteen much slower and eat much later.
I have no idea.
They will have nothing to eat at the canteen.
22. 单选题
20 秒
What is the measurement unit of speed/velocity
Newton (N)
m/s (meter per second)
kg
m/s^2
23. 单选题
20 秒
What is the measurement unit of Mass?
kg
Newton (N)
m/s
meter
24. 单选题
20 秒
Who has the more mass (in kg)?
Alice
Lydia
Browning
All of the above have the same mass.
25. 单选题
20 秒
What is the equation of Newton's Second Law of Motion?
Force = Mass x Acceleration (F = M x A)
Force = Mass + Acceleration (F = M + A)
Force = Mass - Acceleration (F = M - A)
Force = Mass / Acceleration (F = M ÷ A)
26. 单选题
20 秒
If you kick a soccer ball with a force of 10N, then with 20N, how would the acceleration change?
It has no change.
It would double.
It would triple.
It would increase 4 times.
27. 单选题
20 秒
If an object's mass doubles and the acceleration stays the same, how would the force change?
It would be the same.
It would double.
It would triple.
It would cut into half.
28. 单选题
20 秒
If an object's mass doubles and its acceleration cut in half, how would the force change?
It would be the same.
It would double.
It would triple.
It would cut into half.
29. 单选题
20 秒
If Net Force is 10 N, Mass is 5 kg, what is the Acceleration?
2 m/s/s
2 m
50 m/s/s
5 m
30. 单选题
20 秒
Which of the following is an example of Newton's 2nd Law?
Not wearing a seatbelt in a car.
Hitting a softball, the harder the hit, the faster the ball goes.
Eating an yummy ice-cream in hot summer.
Wearing a thick jacket in winter.
31. 单选题
20 秒
What is a Net Force?
The force of one side (in N) + the force of the opposite side(N). No need Direction.
The force of one side (in N) - the force of the opposite side (N). With Direction.
The force of one side (in N) - the force of the opposite side (N). No need Direction.
The force of one side (in N) + the force of the opposite side (N). With Direction.
32. 单选题
20 秒
What is the Net Force with a SAME Direction?
Force at one side (in N) + Force at opposite side (in N), SAME direction
Force at one side (in N) - Force at opposite side (in N), SAME direction
Force at one side (in N) x Force at opposite side (in N), SAME direction
Force at one side (in N) / Force at opposite side (in N), SAME direction
33. 单选题
20 秒
Alice accelerates red wagon when Lydia pulls in same direction, doubling net force on wagon. What's wagon acceleration?
It quadruples
It doubles
It halves
Nothing
34. 单选题
20 秒
What does Newton's Third Law state?
F = M x A
Law of Inertia
For every ACTION (force), there is an equal and opposite REACTION (force).
Law of Playing with Cats Happily.
35. 单选题
20 秒
What does "Action" mean in Newton's Third Law of Motion?
None of the below.
The force that the object applies to itself.
The force that the Second object applies to the First Object as a result of of the Action
The force that the First object applies to the Second Object.
36. 单选题
20 秒
What does "Reaction" mean in Newton's Third Law of Motion?
The force that the Second Object applies to the First Object as a result of the Action.
The force that the First Object applies to the Second Object.
The force that the object applies to itself.
None of the above.
37. 单选题
20 秒
Which of the following is/are the example(s) of Newton's Third Law of Motion? (can be multiple answers)
Action: Rocket Gases push DOWN on air. Reaction: Air pushes UP on rocket.
Action: Swimmer pushes his hands against water. Reaction: water pushes back on his hands to move forward.
Action: Bird's wings push DOWN on air. Reaction: Air pushes UP on wings.
All of the above.
38. 单选题
20 秒
Challenge question: Why does the earth NOT accelerate greatly towards an apple when it falls off a tree?
Because Newton eats the apple.
Because F = M x A. Forces are equal, but masses (of apple vs the Earth) are not the same.
Because Lydia and Alice pick up the apple before it falls onto the ground.
None of the above
39. 单选题
20 秒
What does MOTION means?
A change in an object's position
The location of an object
The change in velocity per change in time
The force of attraction between two objects with mass
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