3. In an experimental setup, 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?(1 point)
Responses
Force
Force
Velocity
Velocity
Acceleration
Acceleration
Mass
Mass
Question 4
4. 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 only moves forward because there is a net force forward.
It only moves forward because there is a net force forward.
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 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.
Question 5
5. 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 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.
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.
Question 6
6. 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 0.4 kg.
The mass of the second rocket should be 0.4 kg.
The mass of the second rocket should be 0.1 kg.
The mass of the second rocket should be 0.1 kg.
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 0.2 kg.
The mass of the second rocket should be 0.2 kg.
Question 7
7. 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.
All five motorboats have the same mass, which can be calculated from the graph.
Question 8
8. 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
5 N backward
5 N backward
5 N forward
5 N forward
10 kg/N backward
10 kg/N backward
10 kg forward
10 kg forward
Question 9
9. 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 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 15 N.
The toy helicopter is flying forward with a force of 15 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.
The toy helicopter is flying forward with a force of 15 N and upward with a force of 10 N.
Question 10
10. Which of the following is a reason why the force required to move a ping pong ball is less than the force required to move a bowling ball? Please select ALL that apply.(1 point)
Responses
A bowling ball has more mass than a ping pong ball.
A bowling ball has more mass than a ping pong ball.
Objects with a lesser mass require a greater force to make them move.
Objects with a lesser mass require a greater force to make them move.
Objects with a greater mass require a greater amount of force to make them move.
Objects with a greater mass require a greater amount of force to make them move.
They are made out of different materials with different levels of friction.
They are made out of different materials with different levels of friction.
Question 11
11. What is the main difference between velocity and acceleration?(1 point)
Responses
The velocity of an object refers to its speed in a given direction. The acceleration of an object refers to an object’s change between its initial velocity and its final velocity.
The velocity of an object refers to its speed in a given direction. The acceleration of an object refers to an object’s change between its initial velocity and its final velocity.
The acceleration of an object refers to its speed in a given direction. The velocity of an object refers to an object’s change between its initial velocity and its final velocity.
The acceleration of an object refers to its speed in a given direction. The velocity of an object refers to an object’s change between its initial velocity and its final velocity.
Question 12
12. A soccer ball is resting on the ground, at rest. What is necessary in order to make the soccer ball move?(1 point)
Responses
a balanced force
a balanced force
an unbalanced force
an unbalanced force
gravity
gravity
momentum
momentum
an unbalanced force
In an experimental setup, 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?(1 point)
Responses
Force
Force
Velocity
Velocity
Acceleration
Acceleration
Mass
Mass
Question 4
4. 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 only moves forward because there is a net force forward.
It only moves forward because there is a net force forward.
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 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 only moves forward because there is a net force forward.
3. In an experimental setup, the car is attached to a string with metal discs at the other end. As the car moves along the table, two probes measure its motion and send information to a computer. The computer displays the acceleration and velocity of the car during the trials. The question asks which quantity stays constant during the trials. To answer this question, we need to understand the definitions of force, velocity, acceleration, and mass.
Force: Force is a push or pull on an object that causes it to change its speed or direction. It is measured in newtons (N).
Velocity: Velocity is the rate at which an object changes its position. It is a vector quantity that includes both speed and direction. Velocity is measured in meters per second (m/s).
Acceleration: Acceleration is the rate at which an object changes its velocity. It is also a vector quantity. Acceleration can be positive, negative, or zero. Acceleration is measured in meters per second squared (m/s^2).
Mass: Mass is the amount of matter in an object. It is a scalar quantity and is measured in kilograms (kg).
In the given choices, the quantity that stays constant during the trials is "Mass." The mass of an object does not change unless additional mass is added or removed. So, during the trials, the mass of the car and the metal discs attached to the string remains constant.
Therefore, the correct answer is: Mass.
To get this answer, we needed to understand the definitions of force, velocity, acceleration, and mass, and their respective units of measurement. Additionally, we needed to compare the definitions to the given experimental setup to determine which quantity stayed constant.