Levi and Clara are trying to move a very heavy box. Levi is pushing the box with a force of 30 N, and Clara is pulling the box with a force of 50 N. The box exerts a frictional force of 65 N.
Which best explains the forces?
There is a net force of 15 N against them and they cannot move the box.
There is a net force of 15 N allowing Levi and Clara to move the box.
There is a net force of 65 N against them and they cannot move the box.
There is a net force of 80 N allowing Levi and Clara to move the box.
The correct answer is: There is a net force of 15 N against them and they cannot move the box.
To determine the net force, we need to sum up all the forces acting on the box. In this case, the force Levi is pushing with is 30 N, the force Clara is pulling with is 50 N, and the frictional force is 65 N.
To calculate the net force, we add up the forces in the direction of motion (assuming they both push/pull in the same direction) and subtract the force opposing motion (the frictional force).
Net force = (30 N + 50 N) - 65 N = 80 N - 65 N = 15 N
Since the net force is 15 N (against them), it means that there is still a force opposing motion (due to friction) that is greater than the force they are applying. Therefore, they cannot move the box.
To determine the net force acting on Levi and Clara and whether they can move the box, we need to calculate the net force by considering the forces involved. The net force is the vector sum of all the forces acting on an object.
In this scenario, there are two forces working in the same direction (Levi's pushing force and Clara's pulling force) and one force working in the opposite direction (the frictional force exerted by the box). To calculate the net force, we need to subtract the force of friction from the combined force of Levi and Clara.
Net force = (Force of pushing by Levi + Force of pulling by Clara) - Force of friction
Net force = (30 N + 50 N) - 65 N
= 80 N - 65 N
= 15 N
The net force acting on Levi and Clara is 15 N.
Now, based on the magnitude of the net force, we can determine if Levi and Clara can move the box. Newton's first law of motion states that an object at rest or in motion will remain in that state unless acted upon by an external force. Therefore, if the net force is non-zero (not equal to 0 N), there will be an acceleration, allowing Levi and Clara to move the box.
From the given options, the correct answer is:
There is a net force of 15 N allowing Levi and Clara to move the box.
To determine the net force, we need to subtract the opposing force of friction from the combined applied forces.
The force exerted by Levi is 30 N, the force exerted by Clara is 50 N, and the frictional force is 65 N.
To find the net force, we need to subtract the frictional force from the combined applied forces:
Net force = (Force applied by Levi + Force applied by Clara) - Frictional force
Net force = (30 N + 50 N) - 65 N
Net force = 80 N - 65 N
Net force = 15 N
Therefore, the correct answer is: There is a net force of 15 N allowing Levi and Clara to move the box.
yay another 80 percent in the test TY!!
You're welcome! I'm glad I could assist you and that you did well on your test. If you have any more questions, feel free to ask. Keep up the good work!
omg are u serious ANOTHER ONE?!? I did like 3...
_______________ is the displacement of an object during a specific unit of time.
The displacement of an object during a specific unit of time is called velocity.
Holden is trying to determine the velocity of his race car. He went 20 meters east, turned around, and went 40 meters west. His car was 20 meters from the starting line. This took 5 seconds.
What is the car’s average velocity?
4 m/s east
4 m/s west
12 m/s west
12 m/s east
To determine the car's average velocity, we need to calculate the total displacement and divide it by the total time taken.
The total displacement is the final position minus the initial position. In this case, the car started at the starting line (0 meters) and ended up 20 meters west.
Total displacement = Final position - Initial position
= -20 meters
The total time taken is given as 5 seconds.
Average velocity = Total displacement / Total time taken
= (-20 meters) / (5 seconds)
= -4 meters/second
The negative sign indicates that the car is moving west, opposite to the chosen positive direction (east).
Therefore, the car's average velocity is 4 m/s west.
An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)
0.83 N
1.2 N
11 N
30 N
To determine the force needed to accelerate an object, we can use the formula F = ma, where F is the force, m is the mass, and a is the acceleration.
In this case, the mass of the object is given as 5 kg and the acceleration is given as 6 m/s^2.
Using the formula F = ma, we can calculate the force:
F = (5 kg) * (6 m/s^2) = 30 N
Therefore, the force needed to accelerate the object at 6 m/s^2 is 30 N.
A graph labeled velocity versus time with horizontal axis time (seconds) and vertical axis velocity (meters per second). A blue line runs straight across at 2 units on the vertical axis for all horizontal axis values.
Based on the graph of velocity over time, which could be the initial velocity and the final velocity for this graph?
initial = 0 m/s; final = 2.5 m/s
initial = 2.5 m/s; final = 2.5 m/s
initial = 3.0 m/s; final = 6.0 m/s
initial = 6.0m/s; final = 3.0 m/s
Based on the graph, the blue line running straight across at 2 units on the vertical axis for all horizontal axis values indicates a constant velocity of 2 m/s.
Therefore, the initial velocity and final velocity for this graph would be:
initial = 2 m/s; final = 2 m/s.
Thus, the correct option is: initial = 2.5 m/s; final = 2.5 m/s.
During which stage of a scientific investigation is it most useful to organize information in graphs and tables?
research related information
identify a problem or need
analyze the results
design an investigation
During the stage of a scientific investigation where it is most useful to organize information in graphs and tables is when analyzing the results.
Analyzing the results involves examining and interpreting the data collected during the investigation. Graphs and tables can effectively present the data in a visual and organized manner, making it easier to identify patterns, trends, and relationships. By organizing the information in graphs or tables, scientists can draw conclusions, make comparisons, and support or refute their hypotheses based on the data.
Hunter’s velocity was 4.5 m/s. At the end of his race, his velocity was the same. Which best describes his movement?
His movement stopped.
His acceleration is zero.
His time was constant.
His acceleration was positive.
Since Hunter's velocity remains constant throughout the race, it can be concluded that his acceleration is zero.
Acceleration is the rate of change of velocity, so if the velocity is constant, it means that there is no change in velocity over time. This indicates zero acceleration.
Therefore, the correct answer is: His acceleration is zero.
Which refers to the standards used to make a judgment or decision when designing a product?
prototypes
criteria
designs
investigations
The term that refers to the standards used to make a judgment or decision when designing a product is "criteria."
Criteria are the specific requirements or standards that a product needs to meet in order to be considered successful or to fulfill its intended purpose. These criteria help guide the design process and allow designers to make decisions or judgments based on whether or not the product meets the established criteria.
Therefore, the correct answer is: criteria.
Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep constant for each object after the objects collide and bounce apart?
velocity
mass
momentum
direction
For each object after the objects collide and bounce apart, Jerome should always keep the momentum constant.
The law of conservation of momentum states that the total momentum of a system of objects remains constant if no external forces act on the system. In the context of a collision and subsequent bouncing apart of objects, the total momentum before the collision should be equal to the total momentum after the collision. This means that the momentum of each individual object must be constant.
Momentum is the product of an object's mass and velocity. While the mass and velocity of objects may change during a collision, the product of the two, which is momentum, should remain constant. Therefore, Jerome should ensure that the momentum of each object after the collision is the same as it was before the collision.
Thus, the correct answer is: momentum.
Which would be represented by FN on a force diagram?
Northern Force
Newton Force
Normal Force
Negative Force
FN on a force diagram typically represents the Normal Force.
The Normal Force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface and prevents the object from sinking into or passing through the surface.
Therefore, the correct answer is: Normal Force.
Which refers to the sum of all the forces that act upon an object?
absolute force
net force
positive force
balanced force
The term that refers to the sum of all the forces that act upon an object is "net force."
The net force is the vector sum of all the individual forces acting on an object. It takes into account the direction and magnitude of each force. If the net force is non-zero, it will cause the object to accelerate or change its state of motion.
Therefore, the correct answer is: net force.
When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?
“force” and “acceleration”
“inertia” and “force”
“action” and “reaction”
“mass” and “inertia”
When discussing Newton’s third law of motion, people most likely use the terms "action" and "reaction."
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on a second object, the second object exerts an equal and opposite force back on the first object.
Therefore, when talking about Newton's third law of motion, people commonly use the terms "action" and "reaction" to describe the reciprocal forces that occur between interacting objects.
A bicycle has a momentum of 36 kg • m/s and a velocity of 4 m/s. What is the mass of the bicycle?
9 kg
32 kg
40 kg
144 kg
To calculate the mass of the bicycle, we can use the formula for momentum: momentum = mass * velocity.
Given that the momentum is 36 kg · m/s and the velocity is 4 m/s, we can rearrange the formula to solve for mass:
mass = momentum / velocity
mass = 36 kg · m/s / 4 m/s
mass = 9 kg
Therefore, the mass of the bicycle is 9 kg.
Olivia places her pet frog on a line to observe the frog’s motion. The line is divided into sections that measure 1 centimeter each. The frog begins at 0, moves 18 centimeters forward, moves 6 centimeters backward, and then 12 centimeters backward.
What is the frog’s displacement?
0
6
18
36
To find the frog's displacement, we need to consider its final position minus its initial position.
The frog begins at position 0, moves 18 centimeters forward, moves 6 centimeters backward, and then 12 centimeters backward.
So, the final position can be calculated as:
Initial position + Distance moved forward - Distance moved backward
Final position = 0 + 18 cm - 6 cm - 12 cm
Final position = 0 cm
Therefore, the frog's displacement is 0.
What is most often given a value of zero to describe an object’s position on a straight line?
displacement
reference point
distance
ending location
The term most often given a value of zero to describe an object's position on a straight line is the reference point.
A reference point is a location that is chosen or designated as the starting point or zero point on a coordinate system or a straight line. It serves as a point of comparison for the positions of other objects.
By assigning a value of zero to the reference point, we establish a frame of reference from which we can measure positive or negative distances or displacements.
Therefore, the correct answer is: reference point.
Which refers to the force that one massive object exerts to attract another object?
velocity
gravity
acceleration
newton
The term that refers to the force that one massive object exerts to attract another object is gravity.
Gravity is a fundamental force of nature that causes objects with mass to be attracted to one another. In accordance with Newton's law of universal gravitation, the force of gravity between two objects is determined by their masses and the distance between them.
Therefore, the correct answer is: gravity.
Which change will cause the gravitational force between a baseball and a soccer ball to increase?
removing the outer layer of the baseball
moving the balls farther apart
wrapping the soccer ball in layers of duct tape
using a baseball with a thinner leather
The change that will cause the gravitational force between a baseball and a soccer ball to increase is moving the balls closer together, not farther apart.
The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Therefore, reducing the distance between the objects will result in an increase in the gravitational force.
Hence, out of the given options, moving the balls closer together is the change that will cause the gravitational force between a baseball and a soccer ball to increase.
Not sure what that meant I guess taping the balls closer since it will increase ANYWAYS.
Anya knows the velocity of an object. What else does she need to know in order to find the object’s momentum?
its mass
its height
its density
its speed
To find the object's momentum, Anya needs to know its mass in addition to its velocity.
Momentum is the product of an object's mass and its velocity. It is a vector quantity that represents the quantity of motion an object possesses. In order to calculate momentum, we multiply the object's mass by its velocity.
So, knowing both the mass and velocity of an object is necessary to determine its momentum. Therefore, Anya needs to know the object's mass.
Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.
Which statement is the best example of an object and motion that would make it hard for people to accept Newton’s first law?
A rolling ball eventually slows down and comes to a stop.
A wagon must be pushed before it begins to move.
The heavier the load in a cart, the harder the cart is to turn.
A box does not move when pushed equally from opposite sides.
The statement that best exemplifies an object and motion that would make it hard for people to accept Newton’s first law is: "A box does not move when pushed equally from opposite sides."
Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest and an object in motion will continue moving with a constant velocity unless acted upon by an external force. This implies that objects tend to maintain their state of motion or rest unless a force acts upon them.
In the given statement, if a box does not move when pushed equally from opposite sides, it seems to defy the concept of inertia and Newton's first law. It suggests that the box is not responding to the equal forces being applied to it, which might be counterintuitive for some people to accept.
Therefore, this statement presents an example that could make it difficult for some people to understand or accept Newton's first law of motion.
Micah knows that a car had a change in velocity of 15 m/s. What does Micah need to determine acceleration.
distance
time
direction
speed
Micah needs to determine the time in order to determine acceleration.
Acceleration is the rate at which an object's velocity changes over time. It is calculated by dividing the change in velocity by the time taken for that change to occur.
To determine acceleration, Micah would need to know the change in velocity, which is given as 15 m/s, and the time taken for that change to occur.
Therefore, the correct answer is: time.
Which shows the correct order of stages of technological design?
design a solution, identify a problem, evaluate the solution, implement the solution
design a solution, implement the solution, evaluate the solution, identify a problem
identify a problem, design a solution, implement the solution, evaluate the solution
identify a problem, evaluate the solution, design a solution, implement the solution
The correct order of stages of technological design is:
1. Identify a problem
2. Design a solution
3. Implement the solution
4. Evaluate the solution
This order follows a logical progression in the design process. First, the problem or need is identified, then a solution is designed to address the problem. After that, the designed solution is implemented or created. Finally, the solution is evaluated to assess its effectiveness and to identify any areas for improvement or further refinement.
Therefore, the correct answer is: identify a problem, design a solution, implement the solution, evaluate the solution.
An object in projectile motion will follow which path?
curved up from the ground
curved down toward the ground
straight down toward the ground
straight up from the ground
COPY N PASTE THIS:
An object in projectile motion will follow which path?
curved up from the ground
curved down toward the ground
straight down toward the ground
straight up from the ground
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