Question

dok 4: extended thinking

1. explain an experiment you could create to demonstrate the conversion of potential energy to kinetic energy using materials you have at home.
2. develop a fictional story that includes characters using potential and kinetic energy in creative ways to solve a problem.

Explanation:

Question 1:

Step1: Identify Materials

Common home materials: toy car, ramp (book), weights, rubber band, ball, string.

Step2: Design Experiment

Use a ramp (book) and toy car. Place car at top (potential energy, \( PE = mgh \)) and release (kinetic energy, \( KE = \frac{1}{2}mv^2 \)) to show conversion.

Step3: Explain Process

At top, car has PE (height). Moving down, PE converts to KE (speed increases). Measure speed at bottom (e.g., time to travel distance) to show KE.

Create a story with characters (e.g., a robot, a scientist) using PE (stored energy) and KE (motion energy) in problem - solving. For example, a robot with a spring (PE) uses it to jump (KE) over an obstacle to deliver a package.

Answer:

An experiment using a toy car, a book (as a ramp), and a stopwatch: 1) Place the book on a table to form a ramp. 2) Hold the toy car at the top of the ramp (potential energy due to height, \( PE = mgh \), where \( m \) is car mass, \( g \) gravity, \( h \) height). 3) Release the car; as it rolls down, potential energy converts to kinetic energy (\( KE = \frac{1}{2}mv^2 \), \( v \) is speed). 4) Use the stopwatch to time how long the car takes to travel a set distance at the bottom, showing kinetic energy (faster speed = more KE).

Question 2: