acceleration

• What is acceleration defined as?

  The rate of change in velocity
• How can acceleration be simply described?

  How quickly something speeds up or slows down
• What are the units of acceleration?

  • Meters per second squared (m/s²)
• What does the delta sign (Δ) represent in physics?

  Change
• How is change in velocity (Δv) calculated?

  Δv = v - u, where v is final velocity and u is initial velocity
• If a car accelerates from 15 m/s to 35 m/s in 5 seconds, what is the change in velocity?

  20 m/s
• How do you calculate acceleration if a car's change in velocity is 20 m/s over 5 seconds?

  Acceleration = 4 m/s²
• Why can acceleration be negative?

  It implies that the object is slowing down or decelerating
• What does average acceleration refer to?

  The overall change in velocity over a time period
• What is uniform or constant acceleration?

  Acceleration that remains the same throughout the time period
• What are the two equations for calculating acceleration?

  1. \( a = \frac{\Delta v}{t} \) (when time is given)
  2. \( v^2 = u^2 + 2as \) (when distance is given)
• When should you use the equation \( a = \frac{\Delta v}{t} \)?

  When time is given
• What is the initial velocity (u) of an object that starts from rest?

  0 m/s
• If a ball is dropped and its final velocity is 7 m/s, what can we assume about its initial velocity?

  It was 0 m/s
• What is the acceleration due to gravity for an object in free fall?

  1. 8 m/s²
• How do you calculate the height from which a ball is dropped if its final velocity is 7 m/s?

  Using the equation \( s = \frac{v^2 - u^2}{2a} \)
• If a ball is dropped and its final velocity is 7 m/s, what is the height from which it was dropped, ignoring air resistance?

  1. 5 meters
• What should you do if you find the calculations in a physics problem challenging?

  Rearrange the equations and plug in the values carefully
• What is the significance of ignoring air resistance in physics problems?

  • Simplifies calculations
  • Assumes ideal conditions
  • Focuses on gravitational effects only