12. Why are airplanes usually designed
with pointed front ends?
A. to reduce air resistance
B. to make them look better
C. to produce more friction
D. to decrease gravity
13. Which of the following reduces friction?
A. using lubricants
B. reducing the area of contact
between surfaces
C. making the surfaces of the
materials smooth
D. all of these
14. Which of the following, when increased,
can cause an increase of friction?
A. Weight
B. volume
C. speed
D. time
15. What could influence an object's
gravitational force?
A. mass
B. color
C. size
D. shape
with pointed front ends?
A. to reduce air resistance
B. to make them look better
C. to produce more friction
D. to decrease gravity
13. Which of the following reduces friction?
A. using lubricants
B. reducing the area of contact
between surfaces
C. making the surfaces of the
materials smooth
D. all of these
14. Which of the following, when increased,
can cause an increase of friction?
A. Weight
B. volume
C. speed
D. time
15. What could influence an object's
gravitational force?
A. mass
B. color
C. size
D. shape
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Answer;
12.) Why are airplanes usually designed
are airplanes usually designedwith pointed front ends?
13.) Which of the following reduces friction?
14. Which of the following, when increased,
14. Which of the following, when increased,can cause an increase of friction?
15. What could influence an object's
15. What could influence an object'sgravitational force?
Fun Fact:
did you know that the elephants are only the animal that can't jump?
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