Grade 9 Science Worksheets

Learning Objectives

• Explain how impulse relates to change in momentum, including the role of net force and time interval
• Use the idea of impulse to predict how different force–time combinations can produce the same momentum change
• Determine how direction affects impulse and momentum change+ Show more

Learning Objectives

• Explain how light exhibits wave-like behavior in phenomena such as interference and diffraction
• Describe particle-like behavior of light using models based on discrete energy packets
• Apply the photoelectric effect to connect light frequency with electron emission

Learning Objectives

• Explain how momentum depends on mass and velocity and identify momentum units.
• Apply the idea that total momentum of a system is conserved when only internal forces act.
• Compare elastic and inelastic collisions by focusing on momentum conservation versus kinetic energy behavior.

Learning Objectives

• Explain Newton’s second law using net force, mass, and acceleration (Fnet = m a).
• Describe how unbalanced, vector forces determine both the direction and magnitude of acceleration.
• Predict changes in velocity over time using acceleration and the duration of a net force.

Learning Objectives

• Explain how wave reflection and refraction change wave direction and wavelength at a boundary.
• Describe how transmission and absorption affect the amplitude and energy of waves crossing into another medium.
• Use wave models to interpret diffraction and interference patterns from overlapping wave sources.

Learning Objectives

• Explain how wave energy can travel without the transfer of matter
• Use the relationship v = fλ to predict how frequency and wavelength affect wave speed in a given medium
• Compare how wave speed depends on medium and wave type (sound vs electromagnetic waves)+ Show more

Learning Objectives

• Explain how climate models represent physical processes that control Earth’s energy balance and atmospheric circulation
• Interpret how greenhouse-gas emission scenarios produce different projected temperature and precipitation trajectories
• Describe how climate feedbacks (water vapor, ice cover, and clouds) can amplify or dampen warming+ Show more

Learning Objectives

• Differentiate weather from climate using clear definitions and examples.
• Explain how Earth’s energy balance and greenhouse gases can influence long-term temperature and precipitation patterns.
• Describe how natural records (ice cores and ocean sediments) provide evidence of past climate changes.+ Show more

Learning Objectives

• Explain how Earth’s matter moves among reservoirs (atmosphere, hydrosphere, geosphere, and biosphere) through geologic and biological processes
• Describe the water cycle and how evaporation, condensation, and precipitation link atmosphere, surface water, and groundwater
• Trace how carbon and nutrients circulate among atmosphere, oceans, organisms, and rocks+ Show more

Learning Objectives

• Explain how gravity influences the motion of orbiting bodies such as planets and moons
• Describe the relationships among mass, distance, and orbital speed in orbital motion
• Use observed orbital patterns to connect gravitational attraction to predictable trajectories+ Show more

Learning Objectives

• Explain how monitoring data can reveal changes in air and water quality over time
• Describe how monitoring evidence (chemical indicators, flow conditions, and spatial patterns) links pollution to sources and processes
• Use measurement results to evaluate pollution mitigation and prevention strategies+ Show more

Learning Objectives

• Explain the pathway from DNA to RNA to proteins (gene expression) and how it relates to cell function
• Describe how protein structure affects protein function inside cells
• Use molecular reasoning to connect genotype (DNA sequence) to phenotype (observable traits)

Learning Objectives

• Explain how heritable traits can change survival and reproduction in a given environment
• Describe how natural selection can shift phenotype frequencies over multiple generations
• Use population-level patterns to connect trait variation with evolutionary change

Learning Objectives

• Explain how matter cycles through ecosystems as producers, consumers, and decomposers transform nutrients and release elements back to the environment.
• Use the idea of conservation of matter to describe how chemical elements move across trophic levels.
• Differentiate the roles of photosynthesis/chemical building, feeding and respiration/excretion, and decomposition in nutrient cycling.

Learning Objectives

• Explain how allele frequency and trait distributions describe genetic variation in populations
• Determine how random processes, heritable mutations, and gene interactions contribute to variability
• Describe how natural selection can shift allele frequencies from one generation to the next

Learning Objectives

• Explain how tectonic activity, erosion, sedimentation, and weathering form major landforms and influence resource distribution
• Analyze how timescales of Earth processes affect land stability and the availability of resources
• Connect geologic history to real-world groundwater and ecosystem resources

Learning Objectives

• Explain how multicellular organisms are organized from cells to tissues, organs, and organ systems.
• Describe how specialized structures at smaller scales support functions at larger scales (support, transport, regulation, coordination).
• Use evidence from a scientific description to predict how changes at one level can affect higher levels of organization.

Learning Objectives

• Explain how constraints shape feasible engineering designs
• Translate constraints into measurable requirements and identify trade-offs
• Evaluate design options for a system under power, flow, cost, regulatory, and environmental limits+ Show more

Learning Objectives

• Explain how engineering design criteria and constraints guide the development of solutions
• Identify how scientific principles, models, and evidence connect design features to expected performance
• Use measurable requirements to justify whether a design meets safety and performance goals

Learning Objectives

• Explain how engineering design connects scientific knowledge to human and societal needs
• Identify performance requirements related to access, reliability, safety, equity, and long-term usability
• Analyze how technology choices can improve or limit social outcomes

Learning Objectives

• Explain what impact evaluation is and why it considers benefits, risks, and tradeoffs over time
• Identify common impact-evaluation criteria such as environmental effects, health outcomes, resource use, and unintended consequences
• Apply impact-evaluation thinking to compare two engineering or technology options using reliability, emissions, land impacts, and sustainability

Learning Objectives

• Explain the different types of intermolecular forces and how they influence physical properties.
• Compare the strengths of London dispersion forces, dipole–dipole interactions, and hydrogen bonds.
• Relate molecular structure to the behavior and physical properties of substances.+ Show more

Learning Objectives

• Understand the basic structure and function of a cell.
• Identify different organelles and their specific tasks in a cell.
• Explain how cell structure relates to its function and processes such as energy production and waste management.+ Show more

Learning Objectives

• Describe key structural differences between prokaryotic and eukaryotic cells.
• Identify components found in eukaryotic cells but absent in prokaryotes.
• Explain how these differences influence cell function and organism complexity.+ Show more

Learning Objectives

• Explain the hierarchy of biological organization from molecules to organisms.
• Describe the concept of emergent properties at different levels of biological complexity.
• Understand how cellular processes contribute to the function of tissues, organs, and systems.+ Show more

Learning Objectives

• Describe how the innate and adaptive immune responses work to protect the body.
• Explain the communication between immune cells and other systems like endocrine and circulatory pathways.
• Identify the roles of different immune responses in maintaining homeostasis after injury.+ Show more

Learning Objectives

• Understand the concept of homeostasis and its importance in body regulation.
• Identify different body systems involved in maintaining internal stability.
• Describe feedback mechanisms used in homeostasis.+ Show more

Learning Objectives

• Understand the basic concepts of chemical reactions, including reactants, products, and bond changes.
• Interpret and write symbolic chemical equations, including state symbols and stoichiometric coefficients.
• Explain energy transfer during reactions, distinguishing between energy absorption and release.+ Show more

Learning Objectives

• Understand different types of chemical reactions and their characteristic patterns.
• Identify examples of synthesis, decomposition, displacement, and combustion reactions.
• Explain the significance of classifying reactions for prediction and symbolic representation.+ Show more

Learning Objectives

• Understand the concept of limiting reactants in chemical reactions.
• Calculate theoretical yield based on mole ratios and molar masses.
• Differentiate between actual yield and theoretical yield in experiments.+ Show more

Learning Objectives

• Understand the concept of centripetal force and its role in circular motion.
• Describe how speed and radius affect the acceleration in circular motion.
• Analyze the forces involved such as tension, friction, and normal force in curved trajectories.+ Show more

Learning Objectives

• Understand the concept of free body diagrams and their importance in analyzing forces.
• Identify and sketch all external forces acting on an object in a free body diagram.
• Calculate the net force on an object using vector addition of forces.+ Show more

Learning Objectives

• Understand how inclined planes decompose gravitational force into components that affect motion.
• Explain the concept of mechanical advantage and its effects on applied force and distance traveled.
• Analyze the roles of friction and slope angle in determining net acceleration and energy transfer during motion.+ Show more

Learning Objectives

• Understand how mass affects acceleration when a net force is applied.
• Distinguish between inertial mass and gravitational effects in response to forces.
• Apply the force–acceleration relationship to solve quantitative problems involving mass.+ Show more

Learning Objectives

• Explain the concept of impulse as force acting over time and its effect on an object's momentum.
• Describe how collisions involve energy transfer and the differences between elastic and inelastic collisions.
• Analyze force-time profiles during collisions to understand impulse magnitude and direction.+ Show more

Learning Objectives

• Understand the role of kidneys in osmoregulation and fluid balance.
• Identify processes such as filtration, reabsorption, secretion, and concentration in the nephron.
• Explain how hormones like antidiuretic hormone (ADH) and aldosterone regulate fluid and ion balance.+ Show more

Learning Objectives

• Understand the mechanisms involved in thermoregulation and homeostasis.
• Identify how the hypothalamus detects and orchestrates responses to temperature changes.
• Describe the roles of skin blood flow, sweat production, shivering, and metabolic adjustments in temperature regulation.+ Show more

Learning Objectives

• Describe how power measures the rate of energy transfer in mechanical systems.
• Explain the concept of efficiency and how it relates useful output energy to input energy.
• Identify factors that cause energy loss such as heat, sound, or deformation.+ Show more

Learning Objectives

• Understand how insulin and glucagon regulate blood glucose levels.
• Describe the role of pancreatic hormones in metabolic homeostasis.
• Explain the interplay between liver, muscle, and adipose tissues in glucose regulation.+ Show more

Learning Objectives

• Understand the three laws formulated by Sir Isaac Newton and their applications to motion.
• Identify real-world examples illustrating Newton's laws.
• Explain how forces influence the motion of objects.+ Show more

Learning Objectives

• Understand the definition and significance of net force in motion.
• Identify when forces are balanced or unbalanced and predict object motion.
• Learn how to resolve forces into components and add them to determine net force.+ Show more

Learning Objectives

• Understand the functional roles of different eukaryotic cell organelles.
• Identify how organelle specialization supports cellular efficiency and metabolic coordination.
• Describe the processes carried out by mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, and peroxisomes.+ Show more

Learning Objectives

• Understand the principles of mass conservation in environmental systems.
• Identify chemical processes involved in regional environmental issues such as acid rain and nutrient cycling.
• Interpret observable evidence of environmental change using particulate and atomic explanations.+ Show more

Learning Objectives

• Understand the observable signs indicating chemical changes in substances.
• Identify real-world examples of chemical change evidence, such as rusting and combustion.
• Differentiate between physical and chemical changes based on observable evidence.+ Show more

Learning Objectives

• Understand the principle of conservation of atoms and mass in chemical equations.
• Learn how to balance chemical equations to reflect accurate reactant and product ratios.
• Link formula notation to measurable mass relationships in chemical reactions.+ Show more

Learning Objectives

• Understand the different types of chemical reactions such as combustion, synthesis, and decomposition.
• Interpret symbolic chemical equations and relate them to real-world reactions.
• Explain energy exchange in chemical processes and the principle of mass conservation.+ Show more

Learning Objectives

• Understand the principle of conservation of mass in chemical reactions.
• Explain how mass remains constant in closed systems during chemical processes.
• Apply the conservation of mass concept to real-world regional contexts such as emissions and resource processing.+ Show more

Learning Objectives

• Describe the basic components of an atom: protons, neutrons, and electrons.
• Explain how atomic number and mass number relate to isotopes and element identity.
• Understand the Bohr model of electron shells and nuclear composition.+ Show more