Q: A car travels 100 km north and then 100 km east. What is the magnitude of its displacement vector?

$$\sqrt{100^2$ + 100^2$} = \sqrt{20000} = 141.4\ \text{km}$$

Question 1

Which of the following is the correct sequence of steps in the scientific method as described in your notes?

Accepted Answer

1. Recognize a question, 2. Make an educated guess (hypothesis), 3. Predict consequences, 4. Perform experiments, 5. Formulate the simplest general rule

Question 2

A scientist observes an unexpected result in a chemical reaction. According to the scientific method, what should be their next step?

Accepted Answer

Make an educated guess (hypothesis) that might resolve the puzzle

Question 3

Which of the following best describes a scientific theory?

Accepted Answer

A synthesis of a large body of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world

Question 4

What distinguishes a natural law from a theory?

Accepted Answer

A natural law is a general hypothesis or statement about the relationship of natural quantities that has been tested over and over again and has not been contradicted

Question 5

Which of the following is an example of pseudoscience?

Accepted Answer

A claim that ignores evidence and is not testable or falsifiable

Question 6

Why is it important for scientific claims to be falsifiable?

Accepted Answer

It ensures that claims can be tested and potentially proven wrong, which is essential for scientific progress

Question 7

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Question 8

A car travels 100 km north and then 100 km east. What is the magnitude of its displacement vector?

Accepted Answer

$$\sqrt{100^2$ + 100^2$} = \sqrt{20000} = 141.4\ 	ext{km}$$

Question 9

Which of the following physical quantities is a vector?

Accepted Answer

Displacement

Question 10

A student claims that vaccines are unsafe because they read a single article online. According to the scientific method, what is the best way to evaluate this claim?

Accepted Answer

Test the claim through repeated experiments and review the body of scientific evidence

Question 11

Which of the following statements about hypotheses is correct?

Accepted Answer

A hypothesis is an educated guess that can be tested by experiment

Question 12

If a scientist's prediction does not match the experimental results, what should they do next according to the scientific method?

Accepted Answer

Revise the hypothesis and test new predictions

Question 13

Which of the following best describes the role of skepticism in science?

Accepted Answer

To encourage critical thinking and require evidence before accepting claims

Question 14

Which of the following is NOT a step in the scientific method?

Accepted Answer

Accept claims without testing

Question 15

A scientist develops a general statement about the relationship between force and acceleration that has been tested repeatedly and never contradicted. What is this statement called?

Accepted Answer

Natural law

Question 16

Which of the following is a real-world example of a vector quantity?

Accepted Answer

The velocity of a plane flying east at 500 km/h

Question 17

A student measures the time it takes for a ball to fall from a height of 20 m. Which physical quantity is being measured?

Accepted Answer

Scalar quantity

Question 18

Which of the following is the best definition of a principle in science?

Accepted Answer

A general hypothesis or statement that has not been contradicted

Question 19

Which of the following is a correct example of applying the scientific method to a real-world problem?

Accepted Answer

Testing a new drug by performing controlled experiments and analyzing the results

Question 20

A researcher wants to test the effect of temperature on the rate of a chemical reaction. Which step of the scientific method is being performed when they design an experiment to test their prediction?

Accepted Answer

Perform experiments to test the prediction

Scientific Method, Physical Sciences, and Key Concepts in Physics

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