Patulong po

II. Choose the letter of the correct answer.

1. In which direction does friction acts?
A. forward C. backward
B. the same D. opposite
2. When can you say that there is friction?
A. When two objects are in contact with each other.
B. When two objects are not in contact with each other.
C. When two objects start to move in the any direction.
D. When two objects start to move in the same direction.
3. What causes friction?
A. The weight of the two objects.
B. The uneven surfaces of the objects.
C. The smooth surfaces of the objects.
D. The gravitational force that earth exerts on the objects.
4. On which surface is friction greater?
A. rough C. smooth
B. thick D. thin
5. After the rain, the road is wet and slippery. How will it affect the vehicle on the road?
A. It decreases speed C. It increases friction
B. It increases speed D. It will cause traffic

6. Why do tires of the car have hollows and bumps?
A. to lessen friction C. to make the tires sturdy
B. to increase friction D. to make the tires beautiful
7. In which situation is friction useful?
A. pushing a cart C. operating machines
B. pulling a heavy load D. walking on a shiny floor
8. Is friction required when you are sleeping?
A. No, because you are not awake or doing anything.
B. Scientists are not certain because the person is not awake.
C. Yes, because without friction you could roll over and fall off the bed.
D. Sleeping requires only energy, not force.
9. In which situation will there be less friction?
A. Walking on a grassy hill.
B. Walking on a sandy ground.
C. Walking on a rocky road.
D. Walking on cemented road.
10. Argus is happily swimming in the pool with his brother. What kind of friction the brothers are experiencing?
A. rolling friction C. sliding friction
B. fluid friction D. static friction​