my answers:
1.A
2.C
3.D
4.B
5.B
6.A
7.DC
8.
1. If the net force on an object is O N, the forces are considered unbalanced
true
false
2. Most people in the united states use feet and miles to measure distance in their everyday lives. why do scientist in the United States use meters to measure distance?
Meters allow scientist to be more accurate in their measurements
science requires special measurements that are not used in everyday life
All scientist use meters to measure distance to help eliminate confusion
meters are better than feet for measuring objects in motion
3. Which of the following forces cause a feather to fall slower than a bowling ball?
gravity
rolling friction
sliding friction
air resistance
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 a reference point in this scenario?
shark
large rock
water
pacific ocean
5. Which of the following pairs of objects would have the strongest gravitational pull?
Two tall buildings in the same city
two tall buildings in different cities
two stars very far away from each other
two stars very close to each other
6. A maglev train uses powerful magnets to lift the train above the tracks as it moves forward. Such a design reduces which of the following forces?
rolling friction
gravity
air resistance
fluid friction
7. which of the following examples does not demonstrate a change in velocity
an elevator slows down in order to stop at the top floor
a cruise ship travels west at a constant speed
a soccer ball is passed across a field
a train remains at a constant speed as it moves around a bend.
8. which of the following does not need to be measured in order to describe motion?
size of the object
distance the object traveled
velocity of the object
acceleration of the object
6 answers
7.D
8.C
8.C
Hey, I already passed the course. You try to answer the questions and one of us might check and figure out what you are missing. We are not here to take the course for you.
Oh ok I will check
5 is D, close stars. Gravity force between stars is huge despite distance
F = G M2 M2 / d^2
between A and B it would be A because same mass but closer (smaller d^2)
7 is B Train around bend is change in DIRECTION. velocity is vector, speed and DIRECTION
8 is A, size is not motion
F = G M2 M2 / d^2
between A and B it would be A because same mass but closer (smaller d^2)
7 is B Train around bend is change in DIRECTION. velocity is vector, speed and DIRECTION
8 is A, size is not motion
sometimes twin stars hold each other in orbit. Imagine the huge gravitational force !
1 answer