What is the variable that scientists manipulate and test?

• dependent variable

• independent variable

• constant

• control group

Gavan throws a ball at the wall with a speed of 50 mph and it bounces back at him at 40 mph. He decides to throw the ball with a speed of 25 mph and it returns at 20 mph.

What is a possible claim he can make?

• The wall is moving very fast.

• His arm gets sore after throwing twice.

• The higher the speed of the ball the slower it bounces back.

• The higher the speed of the ball the faster it bounces back.

Research Question: Does the type of gasoline in a car affect its top speed?

Identify the dependent variable.

• Type of gasoline

• Type of car

• Top Speed

• Amount of gasoline

Tags

NGSS.MS-PS2-2

Does changing the scent of a brand of dog food affect how much the dog eats?

Which of these would be the control group?

• beef scented

• type of dog

• original scented

• amount of food eaten

Tags

NGSS.MS-LS2-4

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid.

Group A: water.

Group B: apple juice.

Group C: milk.

Each plant has the same amount of soil, sunlight, and listens to the same music.

Identify the independent variable.

• The type of plant

• The amount of sunlight

• The type of music

• The type of liquid

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid.

Group A: water

Group B: apple juice

Group C: milk.

Each plant has the same amount of soil, sunlight, and listens to the same music.

What would be in the control group?

• Group A

• The Plant in soil

• The Plant given sunlight

• The Plant that listens to music

Tags

NGSS.MS-LS1-5

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music.

In this investigation, what are the constants?

• water, apple juice, milk

• plant height

• soil, sunlight, music

• water, apple juice, milk, soil, sunlight, music

Joseph claims he is a better driver than Justin. Justin challenges him to a street race down IL-78. To fairly determine who the better driver is we should have _____.

• Joseph drive a tractor and Justin drive a Ferrari.

• Both vehicles filled with the same type of fuel.

• Joseph drive in reverse while Justin drives forward.

• All statements would make a fair race.

Sponge Bob wants to see if a muscle building lotion will help Patrick bulk up. He decides to rub Patrick with the special lotion for 2 weeks and have him complete a workout plan. Another starfish completes the same workout plan but uses regular lotion. After 2 weeks, Sponge Bob measures their muscles to see if the secret ingredient worked. What is the dependent variable?

• Type of lotion

• Muscle Growth

• Second Starfish

• 2 week time period

How many independent variables should be tested in a controlled experiment?

• one

• two

• three

• as many as possible

Tags

NGSS.MS-PS2-2