Acceleration

• What is acceleration defined as?

  Acceleration is the rate of change in velocity.
• How is acceleration measured?

  Acceleration is measured in meters per second squared.
• What does the delta sign (Δ) represent in physics?

  The delta sign represents change.
• How can change in velocity (Δv) be expressed mathematically?

  Δv can be expressed as v minus 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?

  The change in velocity is 20 m/s.
• How do you calculate acceleration if you know the change in velocity and time?

  Acceleration is calculated by dividing the change in velocity by time.
• What does a negative acceleration indicate?

  A negative acceleration indicates that the object is slowing down or decelerating.
• What is meant by average acceleration?

  Average acceleration refers to the overall change in velocity over a specific time period.
• What is uniform or constant acceleration?

  Uniform or constant acceleration occurs when an object accelerates at the same rate throughout the entire time period.
• What is the second equation for acceleration that includes distance?

  The second equation for acceleration relates distance to change in velocity and time.
• When should you use the equation that includes distance instead of time?

  You should use the distance equation when the unit of distance is given in the problem.
• What happens to the initial velocity (u) if an object starts from rest?

  If an object starts from rest, its initial velocity (u) is zero.
• If a ball is dropped from rest and hits the ground at 7 m/s, what is its initial velocity?

  The initial velocity of the ball is 0 m/s.
• What is the acceleration due to gravity for an object in free fall?

  The acceleration due to gravity is approximately $9.8 \text{ m/s}^2$.
• How do you calculate the height from which a ball is dropped if you know its final velocity?

  You can calculate height by rearranging the equation to find distance using the final velocity and acceleration due to gravity.
• If a ball is dropped and hits the ground at 7 m/s, what is the height from which it was dropped, ignoring air resistance?

  The height from which the ball was dropped is 2.5 meters.
• What assumption can be made about the ball's initial velocity when it is dropped?

  The assumption is that the ball's initial velocity is zero since it starts from rest.
• What is the significance of ignoring air resistance in the calculation of height?

  Ignoring air resistance simplifies the calculation by assuming that only gravity affects the ball's motion.
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