Question 7 (1 point)
Unbalanced forces
a
cause the motion of an object to change.
b
can change an object's speed but not direction.
c
make an object move opposite the applied force.
d
maintain the constant motion of an object.
Question 8 (1 point)
Every few years, sailboats of different countries compete in a race for a trophy called the America's Cup. The boats sail over the same distance. What, besides the distance, is needed to find out the speed of each boat in the race?
a
the time it takes each boat to finish the race
b
the skill of the crew of each boat in the race
c
the speed of the wind during the race
d
the size of each boat in the race
Question 9 (1 point)
When the speed of an object increases, which of the following is true?
a
The object's velocity increases.
b
The object's acceleration decreases.
c
The magnitude of the object's net force decreases.
d
The object's mass decreases.
so what is it?
The correct answer is (a) The object's velocity increases.
To answer question 7, we need to understand the concept of unbalanced forces. Unbalanced forces refer to forces that are not equal in magnitude and act on an object in opposite directions. These forces can cause the motion of an object to change. So, the correct answer is option a: Unbalanced forces cause the motion of an object to change.
To answer question 8, we need to determine what information is necessary to find out the speed of each boat in the race, besides the distance. In order to calculate speed, we need to know the time it takes each boat to finish the race. Therefore, the correct answer is option a: the time it takes each boat to finish the race.
Question 9 is not provided. Could you please provide question 9?