Friction

1. What is friction?

When two surfaces rub together, there is friction.
When lightning strikes something, there is friction.
When something turns into ice, there is friction.
When a building catches fire, there is friction.

2. What does friction do?

When two moving things rub together, friction acts to stop them.
When two moving things rub together, friction acts to speed them up.
When two moving things rub together, friction acts to freeze them.
When two moving things rub together, friction does not do anything.

3. When is friction helpful?

Friction helps you when you need to slow or stop your bike.
Friction helps you when you need to go faster on your bike.
Friction helps you when you want to break your bike.
Friction never helps you.

4. What will friction do to a girl on rollerblades?

Friction will help this girl to slow down or stop.
Friction will help this girl to speed up and keep going.
Friction will help this girl to fall on her face.
Friction will not really do anything to this girl.

5. Why do we want more friction?

Snowy and icy roads can be dangerous; cars slip and slide and accidents can happen.
Snowy and icy roads can be annoying; cars can not move and traffic jams will be everywhere.
Snowy and icy roads can be helpful, so do not reduce friction.
Even in snowy and icy roads, friction does not do anything.

6. What below has a lot of friction?

If we spread sand on the road, friction will go up.
If we spread ice on the road, friction will go up.
If we rub oil over car tires, friction will go up.
If we do nothing, friction will go up anyway.

7. How can you increase friction?

We can put chains around the tires (of cars).
We can cover bicycle tires with grease.
We can spread oil all over the road.
Do nothing.

8. When is friction not helpful?

You can’t go very fast if you try to ride your bike in sand.
You can’t go very fast if you try to drive your car over ice.
You can’t go very fast if you try to ride a skateboard down a hill.
You can always go fast no matter where you go.

9. What below does not have a lot of friction?

Sliding down a smooth surface.
Pushing a heavy box across the floor.
Pushing a shopping cart.
Riding a bike across sand.

10. How can you decrease friction?

We can decrease friction by making the rubbing surfaces smoother.
We can decrease friction by making the rubbing surfaces rougher.
We can decrease friction by breaking the rubbing surfaces.
We can never decrease friction.

11. How can something get hot from friction?

Friction always makes two rubbing surfaces heat up.
Friction always makes two rubbing surfaces cool down.
Friction never makes two rubbing surfaces heat up.
Friction does not do anything to make two rubbing surfaces heat up.

12. Why is heat from fiction a bad thing sometimes?

When a machine runs, some of its parts move and rub against other parts. If they get too hot, a fire could start or the machine could stop working.
When a machine runs, some of its parts move and rub against other parts. If they get too hot, the machine could work better.
When a machine runs, some of its parts move and rub against other parts. If they get too hot, nothing will change.
When a machine runs, some of its parts move and rub against other parts. If they get too hot, the train will disappear.

13. What does lubricating something do to friction?

Oil and grease can make the rubbing surfaces slippery so there is less friction.
Oil and grease can make the rubbing surfaces rougher so there is more friction.
Oil and grease cannot make the rubbing surfaces any different.
Oil and grease can make the rubbing surfaces slippery so there is more friction.

14. What is an example of using friction every day?

When you are brushing your teeth, friction helps get your teeth clean.
When you are sleeping, friction helps you sleep well.
When you are watching TV, friction helps you concentrate it.
When you are reading a book, friction helps you concentrate it.

15. What is the definition of “increase”?

make more
make less
covering or outside layers
device for slowing or stopping something

16. “You can think of friction as a grip or a _____.” Fill in the missing word.

grab
pull
throw
kick

17. “The friction makes the bike move _____ instead of just spinning its wheels.” Fill in the missing word.

ahead
backwards
down
right

18. “The friction makes the wheels turn more slowly or stops them completely.” Which of the following is the opposite of the word “slowly”?

quickly
stopped
slippery
annoyingly

19. “The machine runs more smoothly and safely.” Which of the following is the opposite of the word “safely”?

dangerously
helpfully
nicely
swimmingly

20. “You will feel your hands getting warmer.” Which of the following is similar to the word “warmer”?

hot
cold
chilly
itchy

Manager

퀴즈 Summary

정보

결과

결과

카테고리

1. 질문

1. What is friction?

2. 질문

2. What does friction do?

3. 질문

3. When is friction helpful?

4. 질문

4. What will friction do to a girl on rollerblades?

5. 질문

5. Why do we want more friction?

6. 질문

6. What below has a lot of friction?

7. 질문

7. How can you increase friction?

8. 질문

8. When is friction not helpful?

9. 질문

9. What below does not have a lot of friction?

10. 질문

10. How can you decrease friction?

11. 질문

11. How can something get hot from friction?

12. 질문

12. Why is heat from fiction a bad thing sometimes?

13. 질문

13. What does lubricating something do to friction?

14. 질문

14. What is an example of using friction every day?

15. 질문

15. What is the definition of “increase”?

16. 질문

16. “You can think of friction as a grip or a _____.” Fill in the missing word.

17. 질문

17. “The friction makes the bike move _____ instead of just spinning its wheels.” Fill in the missing word.

18. 질문

18. “The friction makes the wheels turn more slowly or stops them completely.” Which of the following is the opposite of the word “slowly”?

19. 질문

19. “The machine runs more smoothly and safely.” Which of the following is the opposite of the word “safely”?

20. 질문

20. “You will feel your hands getting warmer.” Which of the following is similar to the word “warmer”?