Directions: Choose the letter of the correct answer
1. Which surface has the least amount of friction?
A. Carpet
B. Concrete
C. Grass
D. glass
2. If you pour oil onto a wooden surface, friction will be
A increased
C. reduced
B. remained the same
D. gone
3. The following activities can reduce friction EXCEPT ONE.
A. Adding wheels to a cart
C. Putting oil into door hinges
B. Spreading sand on icy roads
D. waxing the shoes
4. Which of the following causes object to go back to Earth when you throw it
upward?
A. Gravity of the sun
C. Gravity of earth
B. Gravity of thr moon
D. Gravity of other planets
5. Which of the following shows an advantage effect of gravity to man?
A. We walk and we get tired
B. We can fly on space
C. We can keep our feet on the floor
D. We can throw objects on space freely
6. If you throw objects into space it goes back to Earth because of the gravitational
force. Which of the following best describe a gravity?
A. Force that attreacts objects to other objects
B. Force that pposes objects to move forward to each other
C. Force that pull the objects towards the center of the earth
D. Force that causes object to stay in place.
7. Which of the following activities have desirable effect on greater friction?
A. Driving a car
B. moving a furniture
B. Playing in a slide D. placing a plate on top of table
8. Sandpaper, carpet and grass are some examples of objects with less amount of
friction. What else has same amount of friction?
A. Glass
B. floor wax
C. oil
D. gravel​