forces

• What is the term for the pressure exerted by the atmosphere at sea level?

  Atmospheric pressure
• What causes atmospheric pressure?

  Weight of air pressing down
• How does atmospheric pressure change with altitude?

  It decreases as altitude increases
• What is the unit of pressure commonly used in physics?

  Pascals (Pa)
• What does the term 'force' refer to in physics?

  A push or pull on an object
• What is the difference between scalar and vector quantities?

  Scalars have magnitude only; vectors have direction
• Which of the following is a vector quantity?

  Velocity
• What does a free body diagram represent?

  All forces acting on an object
• If an object has a weight of $100 \text{ N}$ and experiences an upward force of $120 \text{ N}$, what is the resultant force?


  $20 \text{ N} \text{ upward}$
• How do you represent vectors graphically?

  Using arrows to indicate magnitude and direction
• What is momentum defined as?

  Mass times velocity
• What is the formula for calculating momentum?

  Momentum = Mass × Velocity
• If a car has a mass of $1,000 \text{ kg}$ and is moving at a velocity of $20 \text{ m/s}$, what is its momentum?


  $20,000 \text{ kg m/s}$
• What is the significance of resultant forces?

  They determine the overall effect on an object
• What are safety precautions in the spring constant practical?

  • Ensure area is clear of obstacles
  • Do not stand near moving parts
  • Wear protective gear
• What are the types of quantities in physics?

  • Scalar: Only magnitude
  • Vector: Magnitude and direction
• What is the purpose of a free body diagram?

  • Illustrates all forces acting on an object
  • Helps analyze the object's motion
• How do you calculate the resultant force on an object?

  1. Identify all acting forces
  2. Add forces in the same direction
  3. Subtract opposing forces
• How do you determine if an object is in equilibrium?

  • The sum of all forces equals zero
  • No resultant force acting on the object