Guys pahelp nako need kon ngayon exam namin to eh kung diko mapapasa to ngayon babagsak ako please guys sana tama yong sagot nyo guys science to eh

3. When two surfaces rub against each other, _____ is produced. *

1 point

A. vapor

B. friction

C. air

D. electricity



This is a required question

4. Friction can prevent _____ *

1 point

A. heat

B. fire

C. fuel

D. motion

5. What decreases friction of the surface? *

1 point

A. rough

B. rocky

C. smooth

D. rugged

6. What surfaces increase friction? *

1 point

A. rough

B. smooth

C. polished

D. lubricated

7. What increases friction on a piece of iron nail? *

1 point

A. oil

B. wheel

C. rust

D. gasoline

8. The force when two objects rub against each other. *

1 point

A. rolling friction

B. air friction

C. fluid friction

D. sliding friction



This is a required question

9. A friction between an object moving in the air. *

1 point

A. air friction

B. fluid friction

C. rolling friction

D. sliding friction

10. A force between a roller or a wheel and the surface where it is contact with. *

1 point

A. sliding friction

B. fluid friction

C. rolling friction

D. air friction

11. A friction between two objects which does not allow them to move. *

1 point

A. kinetic friction

B. static friction

C. sliding friction

D. rolling friction

12. What makes a rolling ball slow down and stop? *

1 point

A. friction

B. gravity

C. brake

D. air resistance

13. How is brake useful? *

1 point

A. It uses friction to make vehicles move faster.

B. It uses friction to slow down a moving vehicle.

C. It uses friction to move the vehicle to any direction.

D. It uses friction to move the vehicle easily.

14. Which of the following describes a falling object? *

1 point

A. It has accelerated motion.

B. It has decelerated motion.

C. It can possibly stop moving.

D. It can go up again.

15. What happens when you go against gravity? *

1 point

A. More force is needed to accelerate.

B. Less force is needed to accelerate.

C. No force is needed to accelerate.

D. No motion occurs.​