Question 1: Acceleration is the rate at which an object changes its velocity over time. It can be positive (speeding up), negative (slowing down), or zero (constant velocity).

Answer: Acceleration is the rate of change of velocity over time, indicating how quickly an object speeds up, slows down, or maintains its velocity.

Question 1: Define acceleration in terms of velocity and time.

Answer: Acceleration is the change in velocity divided by the time taken for that change.

Question 2: Explain why an object moving at a constant speed in a straight line has zero acceleration.

Answer: Because its velocity is not changing, so the rate of change of velocity is zero, meaning zero acceleration.

Question 1: A car accelerates from a velocity of 10 m/s to 25 m/s in 5 seconds. Calculate its acceleration in m/s².

Answer: a = (v - u)/t = (25 - 10)/5 = 15/5 = 3 m/s²

Question 2: An object has an initial velocity of 0 m/s and reaches a velocity of 20 m/s after 4 seconds. What is its acceleration?

Answer: a = (20 - 0)/4 = 20/4 = 5 m/s²

Question 1: Describe a simple experiment to measure the acceleration of a toy car rolling down an inclined plane. Mention the variables involved and safety precautions.

Answer: Set up an inclined plane with a smooth surface, release the toy car from a fixed point, measure the time taken to reach a set distance using a stopwatch, and calculate acceleration using the formula a = 2s / t². Variables include the angle of incline (independent), initial velocity (zero), and measured time and distance (dependent). Safety precautions involve ensuring the surface is stable, avoiding loose clothing near moving parts, and handling the stopwatch carefully.

Question 1: A vehicle's velocity increases from 0 m/s to 30 m/s in 6 seconds. Describe the acceleration trend and its implications for the vehicle's motion.

Answer: The acceleration is constant at 5 m/s², indicating a uniform increase in velocity, meaning the vehicle is speeding up steadily.

Question 1: Describe how understanding acceleration benefits the design of safety features in automobiles, such as airbags and seat belts.

Answer: Knowing acceleration helps engineers design safety features that can deploy rapidly during sudden deceleration, protecting occupants by reducing injury during a crash.

Question 1: In your own words, explain why acceleration is an important concept in understanding motion.

Answer: Acceleration is crucial because it describes how objects change their speed and direction, helping us understand the dynamics of moving objects in everyday life and technology. It allows us to predict motion, design vehicles, and improve safety systems, making it fundamental to physics and engineering.