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
110 N
110 N
30 N
30 N
80 N
80 N
31 N
30 N
Newton's Laws Unit Test
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Question
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 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 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 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 not fall along a line. This shows that as the force increases, the acceleration decreases.
The data points will not 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.
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
acceleration
acceleration
mass
mass
force
force
velocity
mass
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 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 10 N down and 10 N up as those are the greatest forces acting on the animal.
It moves 29 N forward because that's the net force.
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 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.
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 twice as powerful as the motor in rocket B.
Newton's Laws Unit Test
7 of 157 of 15 Items
Question
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 0.2 kg.
The mass of the second rocket should be 0.2 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 0.4 kg.