Acceleration

• What is acceleration?

  Rate of change of velocity
• How does acceleration differ from velocity?

  Acceleration is not the same as velocity
• What does acceleration measure?

  Change in velocity over time
• How do you calculate average acceleration?

  Using the formula $a =$$\frac{\Delta v}{t}$
• If a car accelerates from 2.0 m/s to 6.0 m/s at 2.5 m/s², how long does it take?

  1.6 seconds
• What is deceleration?

  Negative acceleration when slowing down
• How do you estimate deceleration when a car collides with a tree?

  Use typical speed and stopping time
• What is the estimated deceleration of a car stopping from 25 m/s in 1 second?

  25 m/s²
• What is uniform acceleration?

  Constant acceleration over time
• What is the approximate value of acceleration due to gravity?

  9.8 m/s²
• What equation is used for uniform acceleration?

  $v^2 =$$u^2 +$$2as$
• How do you find the final speed of a van decelerating from 23 m/s over 112 m?

  Use $v^2 =$$u^2 +$$2as$
• What is the final speed of a van decelerating at 2.0 m/s²?

  9 m/s
• When can you use the equation $v^2 =$$u^2 +$$2as$?


  When acceleration is uniform
• How do you calculate the height from which a ball is dropped if it hits the ground at 7 m/s?

  Use kinematic equations for free fall
• What is the speed of a ball just before it hits the ground if dropped from height?

  7 m/s
• What is the formula to find height when speed is known?

  Use $h =$$\frac{v^2}{2g}$
• What are the key concepts of acceleration and motion?

  • Acceleration is the rate of change of velocity.
  • Average acceleration can be calculated using $a =$$\frac{\Delta v}{t}$.
  • Deceleration is negative acceleration.
  • Uniform acceleration is constant acceleration.
  • Acceleration due to gravity is approximately 9.8 m/s².
• What are the steps to calculate deceleration after a collision?

  1. Estimate the speed before collision.
  2. Estimate the time to stop.
  3. Use the formula $a =$$\frac{v - u}{t}$.
  4. Report deceleration as a positive value.
• What is the process to find the final speed of an object under uniform acceleration?

  1. Identify initial speed (u) and acceleration (a).
  2. Use the equation $v^2 =$$u^2 +$$2as$.
  3. Rearrange and solve for final speed (v).