S1 Final Physical Science

Imagine you are a scientist studying how different types of soil affect the growth of tomato plants. You want to know whether adding compost to the soil will make the plants grow taller.Which of the following is a correct hypothesis ?

• There are various types of soil that can be used to grow tomato plants.

• Plants with compost in their soil are generally healthier.

• If tomato plants are grown in soil with compost, then they will grow taller than those grown in regular soil because of the ingedients of the soil.

• Tomato plants need water and sunlight to grow.

Answer explanation

The correct hypothesis is that if tomato plants are grown in soil with compost, then they will grow taller than those grown in regular soil because it directly tests the effect of compost on plant height.

Tags

NGSS.MS-LS1-5

Caelyn wanted to find out what shampoo made her hair the shiniest. Everyday she washed her hair with different shampoos and then rated how shiny her hair was, on a scale from 1-10. She washed her hair with Pantene, Herbal Essences, L’Oreal, and on the 4th day just water.What is the independent variable in this experiment?

• Type of shampoo

• Water

• How shiny her hair was

Answer explanation

The independent variable in this experiment is the type of shampoo. Caelyn is changing the shampoo each day to see how it affects the shininess of her hair, which is the dependent variable.

A scientist wants to find out how different amounts of sunlight affect the growth of a plant.What is the dependent variable in this case?

• growth of a plant

• sunlight

• soil

• different amount of sunlight

Answer explanation

The dependent variable is what the scientist measures in the experiment. In this case, it is the growth of the plant, as it is affected by the different amounts of sunlight provided.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

A researcher is studying how the amount of time spent studying impacts test scores among students.what is the dependent variable?

• Amount of time studying

• student test scores

• the teacher

• subject of quiz 3

Answer explanation

In this study, the researcher is examining how studying time affects outcomes. The dependent variable is what is measured, which is the student test scores, as they depend on the amount of time spent studying.

The plant grew 10 cm is an example of which type of observation?

• Qualitative

• Quantitative

Answer explanation

The statement 'The plant grew 10 cm' provides a measurable value, indicating a specific amount of growth. This is an example of a quantitative observation, as it involves numerical data.

The plant is green is an example of which type of observation?

• Qualitative

• Quantitative

Answer explanation

The statement 'The plant is green' describes a characteristic of the plant without using numbers, making it a qualitative observation. Qualitative observations focus on qualities or attributes rather than quantities.

A __________ is a push or pull on an object

• Force

• Pull

• Push

• Fork

Answer explanation

A force is defined as a push or pull acting on an object. While 'pull' and 'push' describe types of forces, the term 'force' encompasses both, making it the correct answer.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Forces are measured in _______

• Acceleration

• speed

• forces

• Newtons

Answer explanation

Forces are measured in Newtons, named after Sir Isaac Newton. This unit quantifies the amount of force applied, distinguishing it from acceleration and speed, which measure different physical concepts.

What is the net force + Direction

• 0 N

• 4 N left

• 4 N right

• 10 N north

Answer explanation

The net force is determined by the sum of forces acting on an object. In this case, the net force is 4 N directed to the right, indicating that the rightward forces are greater than any opposing forces.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the net force + Direction?

• 11 N left

• 11N right

• 16 N left

• 5 N right

Answer explanation

The net force is calculated by subtracting opposing forces. If the total force to the left is greater by 11 N, the net force is 11 N left, making this the correct choice.

Tags

NGSS.MS-PS2-2