A student is riding the school bus. The bus stops as the driver applies the brakes.
Which of these statements best describes this situation?(1 point)
Responses
The school bus does not lose or gain kinetic energy.
The school bus does not lose or gain kinetic energy.
A force is changing the motion of the bus.
A force is changing the motion of the bus.
The bus is gaining energy because of friction.
The bus is gaining energy because of friction.
There is no force acting on the bus so it stops moving.
A force is changing the motion of the bus.
Are you correct?
Yes, I am correct.
Show your work
When the school bus stops, the driver applies the brakes. The brakes exert a force on the bus, causing it to decelerate. This force changes the motion of the bus, slowing it down and eventually bringing it to a stop. Therefore, a force is indeed changing the motion of the bus.
You are positive?
I apologize for the confusion in my previous response. Let me correct myself.
When the school bus stops, the driver applies the brakes. As the brakes exert a force on the bus, it experiences a negative acceleration, causing it to slow down and eventually come to a stop. This change in motion indicates that a force is indeed acting on the bus. Therefore, the correct statement is: A force is changing the motion of the bus.
Thank you
You're welcome! If you have any more questions, feel free to ask.
A pitcher throws a baseball to the catcher. The ball's path begins as a straight line, and then its patch curves toward the ground. Which two forces are acting on the baseball?(1 point)
Responses
electricity and friction
gravity and friction
inertia and magnetism
nuclear and inertia
The correct answer is: gravity and friction. These forces are acting on the baseball as it travels through the air.
Are you correct?
Yes, I am correct. The two forces acting on the baseball as it travels through the air are gravity, which pulls the ball downward, and friction, which opposes its motion and causes the curved path.
Two people are in a rowboat on a river. The current of the river water carries them at a speed of five meters per second even when they are not rowing. What will happen to the boat's motion of no other forces act on the boat?(1 point) Responses The boat's speed will increase. The boat's speed will increase. The boat's speed will decrease. The boat's speed will decrease. The boat's speed will stay the same. The boat's speed will stay the same. The boat will change direction. The boat will change direction.
The boat's speed will stay the same. Since there are no other forces acting on the boat, the current of the river will continue to carry it at a constant speed of five meters per second.
Show your work
Certainly!
In this scenario, we have two forces acting on the boat: the force generated by the rowing of the people in the boat and the force exerted by the current of the river.
Given that the current of the river is carrying the boat at a constant speed of five meters per second, this means that the force generated by the rowing of the people is balanced by the force exerted by the current.
If no other forces act on the boat, there is no additional force to change the balance between these two forces. As a result, the boat's speed will stay the same, maintaining a constant speed of five meters per second.
You are sitting in a stopped bus. When the bus starts moving forward, you appear to move backward relative to the bus. Which statement best explains this observation?(1 point) Responses The force of inertia on you balances the force from the motion of the bus. The force of inertia on you balances the force from the motion of the bus. The bus moves forward, while inertia keep you in place. The bus moves forward, while inertia keep you in place. Inertia prevents the force of the bus from acting on you. Inertia prevents the force of the bus from acting on you. The motion of the bus creates an unbalanced backward force on you.
The statement "The bus moves forward, while inertia keeps you in place" best explains this observation.
Are you correct
Yes, I am correct. The statement "The bus moves forward, while inertia keeps you in place" best explains the observation. When the bus starts moving forward, due to the inertia of your body, you tend to stay in your place momentarily. From the perspective of the bus, it appears as though you are moving backward relative to the bus. This is because your body is resisting the change in motion caused by the bus's acceleration.
Which statement best explains why a paper airplane eventually falls to the ground?(1 point) Responses Inertia acts as a balanced force that slows the airplane and pulls it down. Inertia acts as a balanced force that slows the airplane and pulls it down. The force from throwing the airplane loses strength as the airplane moves. The force from throwing the airplane loses strength as the airplane moves. Inertia creates the new forces acting on the airplane to keep it up. Inertia creates the new forces acting on the airplane to keep it up. The unbalanced forces of air resistance and gravity slow the airplane and pull it down.
The statement "The unbalanced forces of air resistance and gravity slow the airplane and pull it down" best explains why a paper airplane eventually falls to the ground.
Are you correct?
Yes, I am correct. The unbalanced forces of air resistance, which opposes the motion of the paper airplane, and gravity, which pulls the airplane downward, ultimately cause the airplane to slow down and fall to the ground.
Solve the system of two equations using substitution. y= 2 + 3x
4x − 3y = −16 (1 point)
Responses
(2, 10)
(−2, 4)
(2, 8)
(−2, −4)
To solve the system of equations using substitution, we'll substitute the value of y from the first equation into the second equation.
Given:
(1) y = 2 + 3x
(2) 4x - 3y = -16
Substitute the value of y from (1) into (2):
4x - 3(2 + 3x) = -16
4x - 6 - 9x = -16
-5x - 6 = -16
-5x = -10
x = 2
Substitute the value of x into (1) to find y:
y = 2 + 3(2)
y = 8
Therefore, the solution to the system of equations is (2, 8).