Grade 9 Worksheets

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

• Understand the principle of conservation of energy in isolated systems.
• Identify how kinetic and potential energy transform during motion.
• Explain the role of nonconservative forces like friction in dissipating mechanical energy.+ Show more

Learning Objectives

• Understand the structure and function of the plasma membrane.
• Differentiate between passive and active transport mechanisms.
• Identify types of membrane proteins involved in transport.+ 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

• Understand the origin and characteristics of magnetic fields produced by permanent magnets and moving electric charges.
• Interpret magnetic field lines and their directional properties.
• Recognize real-world applications of magnetic fields such as compass navigation and industrial sensing.+ 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

• 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

• 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 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 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

• Understand how to represent and analyze temporally changing systems using time-series descriptions.
• Identify the role of rates, feedback loops, and equilibrium concepts in empirical data.
• Interpret mathematical forms that capture transient and steady-state behaviors.+ Show more

Learning Objectives

• Describe different types of scientific models including mathematical formulae, graphs, schematics, and computational approximations.
• Explain the criteria for selecting appropriate models based on fidelity, simplicity, and predictive ability.
• Understand how mapping model components to measurable observables aids interpretation.+ Show more

Learning Objectives

• Define the key criteria used to establish control and comparability in causal inference.
• Explain how variable isolation, replication, baseline characterization, and appropriate reference conditions influence interpretation of causal claims.
• Assess how residual confounding and uncontrolled variation affect the strength of causal inferences.+ 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 the principles of metric measurement and instrument resolution.
• Learn how calibration affects the accuracy and reliability of measurements.
• Connect raw measurement data to tables and graphs for analysis.+ 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 principles of scaling laws and dimensional similarity.
• Explore proportional reasoning in constructing models and interpreting data.
• Analyze how nonlinearity and scale-dependent effects influence extrapolation.+ Show more

Learning Objectives

• Describe the components and architecture of power distribution systems.
• Explain the process of voltage transformation and its importance in electrical grids.
• Analyze how system topology influences reliability and capacity in power networks.+ Show more

Learning Objectives

• Explain the mechanisms of inheritance by linking chromosomal behavior during meiosis to Mendelian patterns and deviations.
• Utilize pedigree reasoning, Punnett squares, and probability calculations to predict genotypic and phenotypic ratios.
• Connect alterations in gene sequences or expression to observable trait variation through models of dominance, penetrance, and gene interactions.+ Show more

Learning Objectives

• Understand the molecular mechanisms of DNA replication, transcription, RNA processing, and translation.
• Link sequence variations and mutations to changes in gene expression and protein function.
• Use molecular models and sequence reasoning to predict phenotypic effects of allelic changes.+ Show more

Learning Objectives

• Understand how allele frequencies change under various evolutionary forces such as selection, drift, migration, and mutation.
• Explain the Hardy-Weinberg equilibrium as a null model in population genetics.
• Evaluate factors like bottlenecks and founder effects that drive rapid genetic shifts and their implications for biodiversity.+ Show more

Learning Objectives

• Understand the principles of dimensional analysis and unit consistency in physical measurements.
• Apply unit-checking techniques to identify algebraic errors in calculations.
• Derive relationships between quantities using correct units and interpret scaled models.+ 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

• Describe the structure and function of various cell organelles and membranes.
• Explain how cellular compartmentalization affects metabolic processes.
• Analyze how alterations in membrane composition influence diffusion and transport.+ 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 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 how ecosystems respond to multiple factors such as climate variability, land-use change, and species introductions.
• Analyze trophic interactions, feedback loops, and material fluxes within ecosystems.
• Evaluate the effects of disturbances and management scenarios on biodiversity and ecosystem services.+ Show more

Learning Objectives

• Understand the key components that influence Earth's climate, including the atmosphere, oceans, ice, land surface, and living organisms.
• Explain how solar energy and internal Earth's heat contribute to climate patterns.
• Identify factors such as aerosols, greenhouse gases, ocean circulation, and land surface properties that cause climate variability.+ Show more