STAAR Success - Grade 8 Science - Practice #1

Group 1

• 1 N

• 0.25 N

• 2.5 N

• 1.5 N

• The force applied to the car is greater than the opposing force of friction.

• The force applied to the car is equal to the force of friction, resulting in motion.

• The mass of the car decreases as it moves forward.

• The acceleration of the car is constant because the net force is zero.

• 2.5 g/cm³ (glass)

• 5 g/cm³ (steel)

• 0.5 g/cm³ (wood)

• 0.05 g/cm³ (foam)

• 8 N to the left

• 2 N to the right

• 8 N to the right

• 2 N to the left

• Thermal energy to electrical energy

• Chemical energy to mechanical and thermal energy

• Kinetic energy to potential energy

• Sound energy to light and heat energy

• Solar panels

• Optical fibers

• Radios

• Batteries

• Nucleus

• Mitochondria

• Ribosome

• Vacuole

• Conduction in the core

• Convection currents in the mantle

• Radiation from the sun

• Deposition of sediments

Group 11

Source 11.1

• Rift valley

• Mid-ocean ridge

• Mountain range

• Transform fault

• Plates pulling apart and magma rising to the surface

• Plates sliding past each other without crustal destruction

• Plates colliding and forcing crust upward

• Plates sinking into the mantle due to cooling

• Genotype

• Phenotype

• Allele

• Chromosome

• The distance between Earth and the sun changes throughout the year.

• Earth rotates on its axis every 24 hours.

• Earth's axis is tilted relative to its orbital plane around the sun.

• The sun’s energy output varies at different times of the year.

• Radio wave

• Sound wave

• Microwave

• Infrared wave

• Lowering it closer to the ground

• Reducing its mass

• Moving it to a higher position

• Decreasing the gravitational force acting on it

• A liquid changes to a gas without changing its chemical composition.

• A substance dissolves in water to form a clear solution.

• A solid forms when two clear solutions are mixed.

• A metal is heated and becomes liquid.