# Here are the answers to the NEWTONS LAWS UNIT TEST

1.When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens?
Answer : An unbalanced force stops your foot but does not act on the rest of your body.

2.A bowler throws a ball down the lane toward the pins. The ball reaches the pins and slowly moves through them, knocking down the center pins but leaving the end pins standing. The bowler wants the ball to reach all the pins. Which changes should the bowler make so that the ball has a greater acceleration?
Answer : The bowler should choose a ball with less mass or throw the ball with more force.

3.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?
Answer : The data points will fall along a line. This shows that as the force increases, the acceleration increases.

4.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?

5. Students in a science class conducted an investigation to demonstrate that, by Newton’s second law of motion, the ratio between the net force and the acceleration produced is constant. They manipulated the net force applied to an object and measured the acceleration that the object acquired in response. The results are shown in the table.

Net force (N) Acceleration (m/s2)
2.4 9.6
1.4 5.6
3.2 12.8
The students want to present their results in a graph. How should they organize the graph to show the data they collected?
Answer : use the x-axis for the force and the y-axis for the acceleration

6. 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.
Answer : It only moves forward because there is a net force forward.

7. Two rockets with the same mass are accelerated. Rocket A accelerates twice as quickly as rocket B. Which statement is correct?
Answer : The motor in rocket A is twice as powerful as the motor in rocket B.

8.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?
Answer : The mass of the second rocket should be 0.4 kg.

9.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?
Answer : All five motorboats have the same mass, which can be calculated from the graph.

10. In which situation does the reactive force between two colliding objects cause a physical change?
Answer : a baseball player swinging a bat and hitting a baseball, causing the bat to shatter

11.A sledgehammer hits a wall. How do the hammer and the wall act on each other?
Answer : The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.

12 THROUGH 15 are typing questions .

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1. Im gonna put the answers here aswell so it can be quicker .

1.An unbalanced force stops your foot but does not act on the rest of your body.
2.The bowler should choose a ball with less mass or throw the ball with more force.
3.The data points will fall along a line. This shows that as the force increases, the acceleration increases.
4.mass
5.use the x-axis for the force and the y-axis for the acceleration
6.It only moves forward because there is a net force forward.
7.The motor in rocket A is twice as powerful as the motor in rocket B.
8.The mass of the second rocket should be 0.4 kg.
9.All five motorboats have the same mass, which can be calculated from the graph.
10.a baseball player swinging a bat and hitting a baseball, causing the bat to shatter
11.The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.

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2. Here's what I put through 12 through 15 although this hasn't been graded because I just submitted .

12. The second one, the velocity will be faster because Batter B is father away then Batter A. Therefore Batter B's ball will go farther.

13. I DID NOT ANSWER I SKIPPED THIS ONE

14. The acceleration is directly proportional to the net force; the net force equals mass times acceleration; the acceleration in the same direction as the net force; an acceleration is produced by a net force

Force is related to acceleration through the equation F=ma. “F” stands for force, “m” stands for mass and “a” stands for acceleration. Force is a push or pull that an object can exert on other objects. Acceleration is the rate of change of an object's speed.

15. In a crash, there is a power on the two articles that causes a speeding up of the two items; the powers are equivalent in extent and inverse in heading. At the point when you hit a drum with a drumstick, there is a crash. The power the two items discharge makes the drumstick bob on the drum. these are my words.

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3. numer 13
13. this will effect the experiment because there isnt any force on the hanger menaing theres no force against the car.

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4. I LOVE YOU SO MUCH. ALL OF THE MULTI QUESTIONS ARE CORRECT. I’m still waiting for the short answer questions to be graded, and I ofc put them in my own words, BUT THANK YOU SO MUCH.

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5. Omg first Adele’s album and now i get the answers😭 I love y’all

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6. I LOVE YOU TOO AND YOUR WELCOME , helping as much I can

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7. Y'all real ones

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8. thanks means alot guys

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9. OML THANK YOUUUUUU

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10. BabyJr tysm

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11. Welcome <3

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12. Yall welcome <3333

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13. Thank you so much BabyJr!!! <333

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14. Love you all thank you ❤️

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15. @BabyJr you are a legend thank you so much.

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16. Hey I never write on here and thank you baby Jr and do u have snap well do any of y'all have snap

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17. In 3-5 sentences, summarize the balanced forces that are present when a soccer ball is resting on the ground, and the unbalanced forces that are present when a soccer ball is kicked and moves through the air or rolls on the ground.

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