A car’s engine provides a forward force of 2000 N while the force of air resistance is 800 N in the opposite direction. With what force will the car move, and in which direction?(1 point)
Responses
1200 N forward
1200 N forward
16000 N forward
16000 N forward
2800 N forward
2800 N forward
1200 N backward
The answer is:
mass
The car's engine provides a forward force of 2000 N, while the force of air resistance is 800 N in the opposite direction. To determine the overall force, we subtract the force of air resistance from the force of the engine. Thus, the overall force will be 2000 N - 800 N = 1200 N forward. Therefore, the car will move with a force of 1200 N in the forward direction.
what is th answer
The correct answer is:
1200 N forward
Two movers are attempting to push a couch up a ramp. One mover applies a force of 80 N to the right, but the force of friction between the couch and the ramp is providing a force of 110 N in the opposite direction, and the couch slides down the ramp.
At minimum, how much force will the second mover need to apply to help push the couch up the ramp?
(1 point)
Responses
31 N
31 N
110 N
110 N
30 N
30 N
80 N
To determine the minimum force the second mover needs to apply, we need to consider the net force acting on the couch. The first mover applies a force of 80 N to the right, but the force of friction is providing a force of 110 N in the opposite direction.
To counteract the force of friction and start moving the couch up the ramp, the second mover needs to apply a force equal in magnitude but in the opposite direction.
Therefore, the second mover needs to apply a force of 110 N in the forward direction.
The correct answer is:
110 N.
A group of students conduct an experiment to study Newton’s second law of motion. They applied a force to a toy car and measure its acceleration. The table shows the results.
Force (N) Acceleration (m/s²)
2.0 5.0
3.0 7.5
6.0 15.0
If the students graph the data points, which conclusion will they be able to make?
(1 point)
Responses
The data points will fall along a line. This shows that as the force increases, the acceleration decreases.
The data points will fall along a line. This shows that as the force increases, the acceleration decreases.
The data points will fall along a line. This shows that as the force increases, the acceleration increases.
The data points will fall along a line. This shows that as the force increases, the acceleration increases.
The data points will not fall along a line. This shows that as the force increases, the acceleration increases.
The data points will not fall along a line. This shows that as the force increases, the acceleration increases.
The data points will not fall along a line. This shows that as the force increases, the acceleration decreases.
Use the image to answer the question below.
In the experimental setup shown, a car has one end of a string attached to it, and the other end is attached to a fixed number of metal discs. The car moves along the table and two probes sense the motion of the car. The probes send information to a computer that displays the acceleration and velocity of the experiment. When looking at these results, which quantity stays constant during the trials?
A car at the one end of the table is tied to a hanger at the other end of the table using a string and a pully. The hanger is hanging over the side of the table while the car is placed flat on the surface of the table. The hanger can support the metal discs. A ruler, a laptop, and other equipment are also placed on the table.
(1 point)
Responses
mass
mass
velocity
velocity
force
force
acceleration
acceleration
Based on the given information, the quantity that stays constant during the trials is the mass of the car.
The other options, velocity, force, and acceleration, can vary depending on the motion of the car. However, the mass of an object is a constant property that does not change unless modified deliberately.
what ism the answer
Imagine a scenario in which an animal's force is pushing itself forward 5 N, friction is pushing it 4 N backward, gravity is pushing the animal 10 N down, and the animal is pushing itself 10 N up. Describe the movement of the animal.(1 point)
Responses
It moves 29 N forward because that's the net force.
It moves 29 N forward because that's the net force.
It moves 10 N down and 10 N up as those are the greatest forces acting on the animal.
It moves 10 N down and 10 N up as those are the greatest forces acting on the animal.
It moves forward and upward because those are the greatest net forces.
It moves forward and upward because those are the greatest net forces.
It only moves forward because there is a net force forward.
Based on the given forces, we can determine the net force acting on the animal by subtracting the forces pushing it backward (friction) and downward (gravity) from the forces pushing it forward (animal itself).
Net force = (pushing forward force + pushing upward force) - (pushing backward force + gravity force)
Net force = (5 N + 10 N) - (4 N + 10 N)
Net force = 15 N - 14 N
Net force = 1 N forward
Therefore, the animal will move forward with a net force of 1 N.
what is the answer
Apologies for the previous incorrect response.
The correct answer is:
It moves forward and upward because those are the greatest net forces.
Two rockets with the same mass are accelerated. Rocket A accelerates twice as quickly as rocket B. Which statement is correct?(1 point)
Responses
The motor in rocket A is twice as powerful as the motor in rocket B.
The motor in rocket A is twice as powerful as the motor in rocket B.
The motor in rocket A is half as powerful as the motor in rocket B.
The motor in rocket A is half as powerful as the motor in rocket B.
The motor in rocket A is half as powerful as the motor in rocket B.
The motor in rocket A is half as powerful as the motor in rocket B.
The motor in rocket A is four times as powerful as the motor in rocket B.
The motor in rocket A is four times as powerful as the motor in rocket B.
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The correct answer is:
The motor in rocket A is four times as powerful as the motor in rocket B.
This is because acceleration is directly proportional to the force applied. Since rocket A accelerates twice as quickly as rocket B, it means that the net force acting on rocket A is twice as large. Since force is directly proportional to power, it implies that the motor in rocket A is four times as powerful as the motor in rocket B.
A model rocket has a mass of 0.2 kg, with a motor that can provide a force of 100 N. A second model rocket is being built with the same motor, but it is being designed to accelerate half as much as the first rocket. What kind of change can be made in the design to achieve this objective? (1 point)
Responses
The mass of the second rocket should be 0.01 kg.
The mass of the second rocket should be 0.01 kg.
The mass of the second rocket should be 0.4 kg.
The mass of the second rocket should be 0.4 kg.
The mass of the second rocket should be 0.2 kg.
The mass of the second rocket should be 0.2 kg.
The mass of the second rocket should be 0.1 kg.
To achieve the objective of having the second rocket accelerate half as much as the first rocket, we need to consider Newton's second law of motion, which states that acceleration is inversely proportional to mass when force is constant.
Since the force provided by the motor is constant (100 N), decreasing the acceleration by half means the mass should be doubled.
Therefore, the correct answer is:
The mass of the second rocket should be 0.4 kg.
Five motorboats are being tested to see which reaches the highest velocity in the same amount of time. After graphing the acceleration versus force for each motorboat, the graph is a sloped line with a y-intercept of zero. Which statement is correct about these motorboats?(1 point)
Responses
All five motorboats have the same mass, which cannot be calculated from the graph.
All five motorboats have the same mass, which cannot be calculated from the graph.
All five motorboats have the same final velocity, which can be calculated from the graph.
All five motorboats have the same final velocity, which can be calculated from the graph.
All five motorboats have the same final velocity, which cannot be calculated from the graph.
All five motorboats have the same final velocity, which cannot be calculated from the graph.
All five motorboats have the same mass, which can be calculated from the graph.
Based on the given information, the graph shows a sloped line with a y-intercept of zero. This indicates that acceleration is directly proportional to force.
From the graph, we cannot determine the final velocity or the mass of the motorboats. Therefore, the correct statement is:
All five motorboats have the same mass, which cannot be calculated from the graph.
If a soccer ball’s mass is 5 kg and a player who weighs 50 kg kicks the soccer ball forward with a force of 5 N , how much force does the ball exert on the player’s foot and in what direction?(1 point)
Responses
10 kg/N backward
10 kg/N backward
5 N forward
5 N forward
5 N backward
5 N backward
100 kg forward
According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means that if the player exerts a force of 5 N forward on the soccer ball, the ball will exert an equal force of 5 N backward on the player's foot.
Therefore, the force the ball exerts on the player's foot is:
5 N backward.
By examining the given data, we can see that as the force increases, the acceleration also increases.
Therefore, the correct conclusion that the students will be able to make is:
The data points will fall along a line. This shows that as the force increases, the acceleration increases.
A toy helicopter flies forward with a force of 15 N into an oncoming wind of 10 N. The force of gravity pulls the helicopter down with a force of 5 N, but the propeller is providing an upward force of 10 N.
Which of the following accurately describes the helicopter’s force?
(1 point)
Responses
The toy helicopter is flying forward with a force of 15 N.
The toy helicopter is flying forward with a force of 15 N.
The toy helicopter is flying forward with a force of 10 N and upward with a force of 5 N.
The toy helicopter is flying forward with a force of 10 N and upward with a force of 5 N.
The toy helicopter is flying forward with a force of 5 N and upward with a force of 5 N.
The toy helicopter is flying forward with a force of 5 N and upward with a force of 5 N.
The toy helicopter is flying forward with a force of 15 N and upward with a force of 10 N.
To determine the overall force of the toy helicopter, we need to consider the different forces acting on it. The helicopter is flying forward with a force of 15 N, while the oncoming wind provides a force of 10 N in the opposite direction.
Since these two forces are in the opposite direction, we subtract the force of the oncoming wind from the forward force:
Overall force = forward force - force of oncoming wind
Overall force = 15 N - 10 N
Overall force = 5 N forward
Additionally, the force of gravity pulls the helicopter down with a force of 5 N, but the propeller provides an upward force of 10 N. Since these two forces are in the opposite direction, we subtract the force of gravity from the upward force:
Overall upward force = upward force - force of gravity
Overall upward force = 10 N - 5 N
Overall upward force = 5 N upward
Therefore, the accurate description of the helicopter's force is:
The toy helicopter is flying forward with a force of 5 N and upward with a force of 5 N.
In 1-2 sentences, summarize why the force required to move a ping pong ball is less than the force required to move a bowling ball. (2 points)
BoldItalicUnderlineBullet listNumbered list
Short Answer Rubric (2 points)
Points Criteria
2
The answer is very clear.
The answer is fully supported by details.
There may be a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.
1
The answer is somewhat clear.
Details are weak or not related.
There are some errors in grammar, usage, and mechanics. Errors interfere with meaning.
0
The question is not answered.