A plane is flying at a speed of 70 kilometers per hour. Then a tailwind (moving in the same direction as the plane) of 5 kilometers per hour acts on the plane. How is the plane’s net force calculated?(1 point)

Question

Responses

Multiply the two forces
Multiply the two forces

Subtract the smaller force from the greater one

Add the two forces together
Add the two forces together

Divide the larger force by the smaller force
Divide the larger force by the smaller force

Answer 1

To determine the plane's net force when considering the tailwind, you should add the two forces together.

In this case, the speed of the plane (70 kilometers per hour) and the speed of the tailwind (5 kilometers per hour) are both acting in the same direction, so you simply add them together to find the total speed of the plane relative to the ground.

Therefore, the correct response is: Add the two forces together.

Answer 2

two kids play a game of tug-of-war, but the flag in the middle of the rope is NOT moving. What force is being applied to the rope?(1 point)
Responses

The kids apply equal forces in similar directions.
The kids apply equal forces in similar directions.

The kids apply equal force in opposing directions.
The kids apply equal force in opposing directions.

A kid applies more force in one direction.
A kid applies more force in one direction.

One kid applies force and the other does not.

Answer 3

If the flag in the middle of the rope is NOT moving, it indicates that the forces applied by both kids are balanced. In this case, the correct response is: The kids apply equal force in opposing directions.

This is known as equilibrium, where the forces acting on an object are equal in size but opposite in direction, resulting in no net force and no movement.

Answer 4

A student is moving furniture. Even though table A and table B are the same size, table A requires more force to move. Why?(1 point)
Responses

Table A has a greater mass than table B.
Table A has a greater mass than table B.

Table A has greater volume compared to table B.
Table A has greater volume compared to table B.

Table A has less density than table B
Table A has less density than table B

Table A has less weight than table B.
Table A has less weight than table B.

Answer 5

The reason that table A requires more force to move despite being the same size as table B is that Table A has a greater mass than table B.

The amount of force required to move an object is directly related to its mass; according to Newton's second law of motion (F = ma), greater mass leads to a need for greater force to overcome inertia and initiate movement.

So, the correct response is: Table A has a greater mass than table B.

Answer 6

Newton's First Law says that an object at rest will remain at rest, and an object in motion will remain in motion unless it is acted on by an outside force. This is the law of__________.(1 point)
Responses

inertia
inertia

velocity
velocity

momentum
momentum

gravity

Answer 7

This is the law of inertia.

Inertia is the property of an object to resist changes in its state of motion, meaning that an object at rest stays at rest and an object in motion continues moving at a constant velocity unless acted upon by an external force. Therefore, the correct response is: inertia.

Answer 8

A student is investigating mass and acceleration. The student applies the same force of 40 N force to two boxes that have the same size and shape. Box 1 experiences an acceleration of 10 m/s^2 and box 2 experiences an acceleration of 5m/s^2.

The student claims that box 1 must have a smaller mass than box 2. Which argument best supports the student's claim?(1 point)
Responses

Heavier objects need less force than lighter objects to accelerate at the same rate.
Heavier objects need less force than lighter objects to accelerate at the same rate.

Heavier objects need greater force than lighter objects to accelerate at the same rate.
Heavier objects need greater force than lighter objects to accelerate at the same rate.

Lighter objects need less force than heavier objects to start moving but will accelerate at the same rate.
Lighter objects need less force than heavier objects to start moving but will accelerate at the same rate.

Lighter objects need greater force than heavier objects to start moving but will accelerate at the same rate.

Answer 9

The best argument to support the student's claim that box 1 must have a smaller mass than box 2 is: Heavier objects need greater force than lighter objects to accelerate at the same rate.

This aligns with Newton's second law of motion, which states that force is equal to mass times acceleration (F = ma). If both boxes experience the same force (40 N) but have different accelerations, this suggests that box 1, which has the greater acceleration (10 m/s²), has a smaller mass compared to box 2, which has a lower acceleration (5 m/s²). Therefore, heavier objects would require more force to achieve the same acceleration.

Answer 10

Two forces act on an object. One force has a magnitude of 30N directed west, and the other force has a magnitude of 12 N directed east. What is the net force on the object?(1 point)
Responses

18N west
18N west

42 N east
42 N east

18N east
18N east

42N west

Answer 11

To find the net force on the object, you need to subtract the forces acting in opposite directions.

You have:

• A force of 30 N directed west
• A force of 12 N directed east

The net force can be calculated as follows:

\[ \text{Net Force} = \text{Force}\text{west} - \text{Force}\text{east} \] \[ \text{Net Force} = 30 , \text{N west} - 12 , \text{N east} \]

Since east is in the opposite direction to west, you can treat it as a subtraction:

\[ \text{Net Force} = 30 , \text{N} - 12 , \text{N} = 18 , \text{N} , \text{west} \]

Therefore, the correct response is: 18N west.