Science 🧪🧪

• What are the three states of matter?

  Solid, liquid, gas
• What happens to a solid when it melts?

  It changes into a liquid
• What is diffusion?

  Movement of particles from high to low concentration
• What is the fixed shape and volume characteristic of?

  Solid state of matter
• How do gas particles behave in a balloon?

  They move freely and create gas pressure
• What is the process of a liquid turning into a gas called?

  Evaporation
• What is the scientific name for a particle?

  Atom
• What is gas pressure?

  Force exerted by gas on a container
• What is Brownian motion?

  Movement of large particles by smaller particles
• What is the formula for total magnification in microscopy?

  Eyepiece lens magnification x objective lens magnification
• What are the steps to prepare a microscope slide?

  1. Take a sample (e.g., onion cells)
  2. Add stain (e.g., iodine)
  3. Place a cover slip on top
  4. Put the slide onto the stage
  5. Use focusing knobs to view the sample
• Why are cells considered the building blocks of living organisms?

  They make up all living organisms
• What is a unicellular organism?

  An organism made of one cell
• What is the function of muscle cells?

  To contract and create movement
• What do root hair cells do?

  Increase surface area for diffusion
• What are the functions of the skeletal system?

  Movement, support, protection
• What are the types of joints in the skeletal system?

  • Hinge joint: movement backwards and forwards
  • Ball and socket joint: movement in all directions
  • Fixed joint: does not move at all
• What is the unit of force?

  Newton (N)
• What is the formula for speed?

  Speed = distance/time
• What happens when the resultant force on an object is zero?

  The object remains stationary or moves at constant speed
• What are balanced forces?

  Opposing forces that are equal in size
• What is acceleration?

  Objects speeding up
• What is deceleration?

  Objects slowing down
• If a vehicle travels 50m in 25 seconds, what is its speed?

  $2 \text{ m/s}$
• If a vehicle travels 30m in 10 seconds, what is its speed?

  $3 \text{ m/s}$
• Who proposed the three laws of motion?

  Isaac Newton
• What does a thicker arrow represent in force diagrams?

  Larger forces
• What is the difference between balanced and unbalanced forces?

  Balanced forces are equal; unbalanced are unequal
• What is drag?

  Force acting on an object moving through air or water
• What is friction?

  Force that resists motion between surfaces
• What is equilibrium in terms of forces?

  When forces are balanced
• What is the resultant force?

  The overall result of all forces acting
• What is the unit for measuring force?

  Newton (N)
• What does acceleration indicate about an object's motion?

  It indicates the object is speeding up
• What does deceleration indicate about an object's motion?

  It indicates the object is slowing down
• How can speed be determined from a graph?

  By analyzing the steepness of the line
• What is the significance of the resultant force being zero?

  The object remains stationary or moves at constant speed
• What is the relationship between distance, speed, and time?

  Speed = distance/time
• What happens to an object when unbalanced forces act on it?

  It accelerates or decelerates
• What is the effect of balanced forces on a stationary object?

  It stays still