In the investigation 'which type of soil makes the plant grow the fastest', which of the following is a controlled variable?

C) Amount of water each test gets

Identify the independent, dependent, and controlled variables in the experiment: Investigate what type of ball rolls furthest down a ramp.

Independent variable: type of ball; Dependent variable: distance rolled; Controlled variables: ramp, surface, starting point

Independent variable: ramp height; Dependent variable: type of ball; Controlled variables: distance rolled, surface

Independent variable: distance rolled; Dependent variable: type of ball; Controlled variables: ramp, surface

Independent variable: surface type; Dependent variable: ramp height; Controlled variables: type of ball, distance rolled

In science, what is a fair test?

A test where you only change one variable and keep all other variables the same

A test where you change all variables

A test where you do not change any variables

A test where you change two variables

When planning and conducting an investigation, why is it important to use the right equipment for what you are measuring?

It allows for more accurate and specific measurements.

It makes the experiment more expensive.

It ensures the results are always positive.

It reduces the need for safety precautions.

Name two examples of equipment mentioned in the passage that are used in scientific investigations.

Beakers, test tubes, measuring cylinders, Bunsen burners, timers, thermometer (any two)

Chairs, tables, blackboards, erasers, chalk (any two)

Pens, pencils, notebooks, rulers, erasers (any two)

Shoes, hats, gloves, scarves, belts (any two)

What is one reason digital cameras are useful in scientific measurements?

They allow us to go back and look at what happened so we can get a more accurate measurement.

They automatically analyze all data without human input.

They can only take black and white photos.

They replace the need for any other scientific instruments.

According to the passage, what is one way to measure how high someone can jump using a camera?

By recording them jumping next to a ruler and checking frame-by-frame

By asking them how high they think they jumped

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. 1. John was investigating how the amount of sunlight affects the size of the leaves of a tree.

IV: Amount of sunlight DV: Size of the leaves of a tree

IV: Size of the leaves of a tree DV: Amount of sunlight

IV: Type of tree DV: Amount of sunlight

IV: Size of the leaves of a tree DV: Type of tree

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. 2. Madeline carried out a test to see if the height of a person was related to how fast they can run.

IV: Height of a person DV: How fast they can run

IV: How fast they can run DV: Height of a person

IV: Age of a person DV: How fast they can run

IV: Height of a person DV: Age of a person

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. 3. Akbar did a scientific investigation to measure how much energy was stored in different types of crisps.

IV: Types of crisps DV: Amount of energy stored

IV: Amount of energy stored DV: Types of crisps

IV: Types of crisps DV: Flavour of crisps

IV: Colour of crisps DV: Amount of energy stored

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. 4. Jayden conducted a survey to find out if the most common hair colour was the same in boys and girls.

IV: Gender (boys and girls) DV: Most common hair colour

IV: Most common hair colour DV: Gender (boys and girls)

IV: Boys and girls with brown hair DV: Number of surveys conducted

IV: Survey method DV: Hair colour of investigator

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. 5. Sasha did a series of investigations to see if the height of a ball’s bounce was dependent on the size of the ball. What are the IV and DV in this investigation?

IV: Size of the ball DV: Height of the ball’s bounce

IV: Height of the ball’s bounce DV: Size of the ball

IV: Weight of the ball DV: Size of the ball

IV: Color of the ball DV: Height of the ball’s bounce

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. For each dependent variable you identify, suggest a piece of equipment that could be used to measure it, and the units of measure that are most appropriate. 1. Elizabeth carried out an investigation to observe the relationship between water temperature and how quickly it can be frozen.

IV: Water temperature DV: Time taken to freeze Equipment: Stopwatch or timer Units: Seconds or minutes

IV: Time taken to freeze DV: Water temperature Equipment: Thermometer Units: Degrees Celsius

IV: Water volume DV: Water temperature Equipment: Measuring cylinder Units: Milliliters

IV: Type of container DV: Water temperature Equipment: Thermometer Units: Degrees Celsius

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. For each dependent variable you identify, suggest a piece of equipment that could be used to measure it, and the units of measure that are most appropriate. 2. Rhys was investigating how far a car continued to travel after braking on different road surfaces.

IV: Type of road surface DV: Distance traveled after braking Equipment: Measuring tape or meter stick Units: Meters or centimeters

IV: Speed of the car DV: Type of road surface Equipment: Stopwatch Units: Seconds

IV: Distance traveled after braking DV: Type of road surface Equipment: Thermometer Units: Degrees Celsius

IV: Type of car DV: Color of the road surface Equipment: Ruler Units: Inches

For each of the investigations described you need to identify the independent variable (IV) and the dependent variable (DV). Remember: the independent variable is changed by the investigator, and the dependent variable is measured and recorded. For each dependent variable you identify, suggest a piece of equipment that could be used to measure it, and the units of measure that are most appropriate. 3. Mohammed carried out an investigation to find out how far a spring could be stretched before it wouldn’t recoil to its original shape again.

IV: Force applied to the spring DV: Extension of the spring before permanent deformation Equipment: Ruler or meter stick Units: Centimeters or millimeters

IV: Length of the spring DV: Mass attached to the spring Equipment: Stopwatch Units: Seconds

IV: Temperature of the spring DV: Color of the spring Equipment: Thermometer Units: Degrees Celsius

IV: Material of the spring DV: Time taken to stretch Equipment: Balance Units: Grams

John was investigating how the amount of sunlight affects the size of the leaves of a tree. IV: ________ DV: ________ (Identify the independent variable (IV) and dependent variable (DV) in the scenario.)

IV: amount of sunlight; DV: size of the leaves

IV: size of the leaves; DV: amount of sunlight

IV: type of tree; DV: amount of sunlight

IV: size of the leaves; DV: type of tree

Madeline carried out a test to see if the height of a person was related to how fast they can run. (Identify the independent variable (IV) and dependent variable (DV) in the scenario.)

IV: height of the person; DV: how fast they can run

IV: how fast they can run; DV: height of the person

IV: age of the person; DV: how fast they can run

IV: weight of the person; DV: how fast they can run

Akbar did a scientific investigation to measure how much energy was stored in different types of crisps. (Identify the independent variable (IV) and dependent variable (DV) in the scenario.)

IV: type of crisp; DV: how much energy

IV: how much energy; DV: type of crisp

IV: amount of salt; DV: type of crisp

IV: temperature; DV: amount of salt

Jayden conducted a survey to find out if the most common hair colour was the same in boys and girls. (Identify the independent variable (IV) and dependent variable (DV) in the scenario.)

IV: boys or girls; DV: hair colour

IV: hair colour; DV: boys or girls

Rhys was investigating how far a car continued to travel after braking on different road surfaces. What is the dependent variable (DV)?

speed of the car before braking

Zi Xin was carrying out an experiment to see how the number of bulbs in a circuit affected the brightness of the light produced. What equipment is used?

data logger (light intensity sensor)/PC

For each item below, specify the independent and dependent variables, as well as constants. 1. A study was done to find if different tire treads affect the braking distance of a car.

I: Tire treads D: Braking distance C: Car, road conditions, speed, etc.

I: Braking distance D: Tire treads C: Car, road conditions, speed, etc.

I: Car D: Tire treads C: Braking distance, road conditions, speed, etc.

I: Speed D: Braking distance C: Car, tire treads, road conditions, etc.

For each item below, specify the independent and dependent variables, as well as constants. 2. The time it takes to run a mile depends on the person’s running speed.

I: Running speed D: Time to run a mile C: Distance (mile), person, track, etc.

I: Time to run a mile D: Running speed C: Distance (mile), person, track, etc.

I: Distance (mile) D: Running speed C: Time to run a mile, person, track, etc.

I: Person D: Distance (mile) C: Running speed, time to run a mile, track, etc.

For each item below, specify the independent and dependent variables, as well as constants. 3. The height of bean plants depends on the amount of water they receive.

I: Amount of water D: Height of bean plants C: Type of plant, soil, sunlight, etc.

I: Height of bean plants D: Amount of water C: Type of plant, soil, sunlight, etc.

I: Type of plant D: Height of bean plants C: Amount of water, soil, sunlight, etc.

I: Sunlight D: Height of bean plants C: Amount of water, type of plant, soil, etc.

Learning Objectives - Planning and Conducting

Authored by Chloe Startup

Science

8th Grade

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Learning Objectives - Planning and Conducting

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In science, what is a variable?

A) Anything that can be controlled, changed or measured in an experiment

B) Only something that can be measured

C) Only something that can be changed

D) Only something that can be controlled

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

There are three types of variables in an investigation: ________, dependent, and independent variables.

controlled

random

manipulated

extraneous

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a type of variable in an investigation?

Controlled

Dependent

Independent

Random

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the independent variable in an experiment?

The thing you measure

The thing you change

The thing that remains the same

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the dependent variable in an experiment?

The thing you change

The thing you measure

The thing that remains the same

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are controlled variables in an experiment?

The thing you change

The thing you measure

Any other variable that remains the same

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the investigation 'which type of soil makes the plant grow the fastest', what is the independent variable?

soil

amount of water

type of plant

amount of sunlight

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Learning Objectives - Planning and Conducting

In science, what is a variable?

There are three types of variables in an investigation: ________, dependent, and independent variables.

Which of the following is NOT a type of variable in an investigation?

What is the independent variable in an experiment?

What is the dependent variable in an experiment?

What are controlled variables in an experiment?

In the investigation 'which type of soil makes the plant grow the fastest', what is the independent variable?

In the investigation 'which type of soil makes the plant grow the fastest', what is the dependent variable?

In the investigation 'which type of soil makes the plant grow the fastest', which of the following is a controlled variable?

Identify the independent, dependent, and controlled variables in the experiment: Investigate what type of ball rolls furthest down a ramp.

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