STAAR Success - Grade 8 Science - Practice #1

Read each question carefully. Choose the best answer to each question. For open-response questions, determine the best answer to the question.

A student pushes a toy car on a flat surface with a constant force. The car's acceleration is recorded as 2 m/s², and its mass is 0.5 kg.

What is the net force acting on the car?

Which statement explains why the car accelerates as calculated in Part A?

Students measure the mass of a block as 20 g and its volume as 4 cm³. Using the density formula D=mvD=\frac{m}{v}D=vm, calculate the block's density and identify its material from the options below:

Describe the changes in molecular motion and energy when a solid is heated to its melting point and transitions into a liquid.

Two forces act on a box: 5 N to the right and 3 N to the left. What is the net force, and in which direction will the box move?

Which energy transformation occurs when a battery-operated fan is turned on?

Which technology uses light waves to transfer information over long distances?

Which organelle is responsible for energy production in both plant and animal cells?

Compare the role of xylem in plants with the role of blood vessels in humans.

Identify the secondary consumers in the food web depicted here, and explain their role in energy transfer.

Which process is primarily responsible for the movement of tectonic plates?

A diagram shows the movement of tectonic plates at a convergent boundary.

What feature is most likely to form at this type of boundary?

Which process is responsible for the feature identified in Part A?

Which term describes the physical appearance of an organism resulting from its genetic makeup?

Why does Earth experience seasons?

Which type of wave requires a medium to travel through?

Which factor increases the potential energy of an object?

Which observation indicates that a chemical reaction has occurred?