# Chapter 1 - Science In Our World Flashcards

1
Q

What is the independent variable?

A

The factor that is purposely changed in an experiment to test a hypothesis

2
Q

What is the dependent variable?

A

The outcome of the experiment; the result that was caused by the independent variable

3
Q

Name the independent and dependent variables of this experiment: Paul wants to test how adding crushed eggshells to soil affects the growth of plants.

A

Independent variable: The amount of crushed eggshells in the soil.
Dependent variable: The growth/height of the plants

4
Q

What is an assistive bioengineering? Give some examples.

A

Engineering resulting in a product or process that helps living organisms but does not change them permanently.
Examples: Crutch, Wheelchair, eyeglasses

5
Q

What is an adaptive bioengineering? Give some examples.

A

Engineering resulting in a product or process that changes living organisms permanently.
Examples: GMOs, heart transplant, laser eye surgery,

6
Q

Name the steps of the engineering design process

A
2. Form a hypothesis
3. Test the hypothesis with experiments
4. Analyze the data from the experiment
5. Draw conclusions
6. Communicate results
7
Q

Why are some steps in the engineering design process repeated?

A

Depending on the situation, scientists may repeat steps if their data from the experiment does not prove the hypothesis, or if they accidentally include bias in their experiment or conduct a step incorrectly.

8
Q

Name the steps of the Engineering Design process.

A
1. Identify a problem and research a need
2. Imagine developing possible solutions
3. Build a prototype
4. Test and evaluate the prototype
5. Improve/modify the prototype
9
Q

What is unintentional bias?

A

When data is not accurate because of incomplete information or a strong opinion about something.

10
Q

Is the following survey biased? Why or why not? Lucy wants to find out how many books people in her town read each month. She surveys 50 residents of the town at the town library.

A

Yes; because her sample only included people at the library, who are likely to read more books per month than others.

11
Q

What is the formula for density?

A
```D = m * v
Density = mass * volume```
12
Q

1ml = ____

A

1cm^3

13
Q

what is the difference between mass and weight?

A

Mass is the measure of how much matter is in an object; it doesn’t change, no matter your location in the universe.

Weight is the measure of how much force an object is emitting due to gravity; it can change depending on your location in the universe

14
Q

Name the tools needed to measure the following properties of an object and the unit to describe them: Length, mass, force/weight, volume(with water displacement)

A

Length: Meter stick (meters(m))
Mass: Balance/Triple balance beam (grams(g))
Force/Weight: Spring scale (Newtons(N))

15
Q

What is water displacement?

A

Finding how much water an object displaces when dropped into water; this is used to measure volume.

16
Q

A graduated cylinder is filled with 25mL of water. Then, an irregularly- shaped rock is placed into the graduated cylinder, and the water level rises to 30mL. What is the volume of the rock in cm^3?

A

5cm^3

30mL - 25mL = 5mL of water displaced by rock = volume of rock = 5cm^3 because 1mL = 1cm^3

17
Q

What is a law?

A

A summary of many experimental results and observations; it tells how things work.

18
Q

What is a model?

A

A pattern, plan, or representation of a the structure or workings of an object