# Friction and Gravity

Question #1: If the net force on an object is 0 N, the forces are considered unbalanced.

a. true
b. false

I think that the answer is "b" since unbalanced forces causes objects to move and have like 5 N or so on.

Question #2: Most people in the United States use feet and miles to measure distance in their everyday lives. Why do scientists in the United States use meters to measure distance?

a. Meters allow scientists to be more accurate in their measurments
b. Science requires special measurements that are not used in everyday life
c. All scientists use meters to measure distance to help eliminate confusion
d. Meters are better than feet for measuring objects in motion

I think the answer is "c" since meter is a SI unit for distance that all scientists use to avoid confusion.

Question #3: Which of the following forces caused a feather to fall slower than a bowling ball?

a. gravity
b. rolling friction
c. sliding friction
d. air resistance

According to what I have studied the answer should be "d" because air resistance is the fluid friction experienced by objects moving through air.

Question #4: A small fish in the Pacific Ocean watches a shark swim by a large rock a few meters away. Which of the following is the reference point in this scenario?

a. shark
b. large rock
c. water
d. Pacific Ocean

According to what I have studied a reference points is the point that the motion of an object can be compared to. So I think the answer is "b".

Question #5: Which of the following pairs of objects would have the strongest gravitational pull?

a. two tall building in the same city
b. two tall buildings in different cities
c. two stars very far away from each other
d. two stars very close to each other

I think the answer is "d" because according to what I have studied stars have a strong gravitational pull so two stars together would have a big gravitational pull.

Question #6: A maglev train uses powerful magnets to lift the train above the tracks as it moved forward. Such a design reduces which of the following forces?

a. rolling friction
b. gravity
c. air resistance
d. fluid friction

I think the answer is "b" because gravity could make the train go down, but with those powerful magnets then it helps the train.

Question #7: Which of the following examples does NOT demonstrate a change in velocity?

a. An elevator slows down in order to stop at the top floor
b. A cruise ship travels west at a constant speed
c. A soccer ball is passed accross a field
d. A train remains at a constant speed as it moved around a bend

According to what I have studied the answer should be "b" because velocity is the speed and direction of moving objects. The cruise ship in answer "b" travels west at a constant speed and that does not demostrate a change in velocity.

Question #8: Which of the following does not need to be measured in order to describe motion?

a. size of object
b. distance the object traveled
c. velocity of the object
d. acceleration of the object

According to what I have studied in order to describe motion, scientists must be able to measure the distance, direction, and speed of a moving object. So I think the answer should be "a".

Thank You
-Gourami

1. 👍 1
2. 👎 2
3. 👁 1,001
1. In Question 1, 2, and 8 I studied more and I know the answer to those questions.

1. 👍 0
2. 👎 3
2. can you tell me if u get the answers and the first one is true

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2. 👎 2
3. bro you on pearson too i need all the right anwers but these guys keep on saying i think

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