Discuss in your group which part should you change to make a catapult that can throw the ball further than mine. I will give you 15 minutes to do this, please stick to the time, we will only test the group who can make it on time. Let’s see which group can beat my record. I will give you 10 minutes to test your catapult, please be fair and record the distance as it is. Try it three times and look for average distance. Now let’s compare your distance and mine. which part is different?, make notes about that, and write it in your exercise book. Read your text book page 14 to 16. According to your observation just now, find an explanation how the different parts of your catapult allow it to throw the ball further than mine, and write your explanation in your exercise book. In 5 minutes share your explanation with your friends in group. Do you have the same explanation? If not, explain to your friend why your explanation is correct or why his/hers is wrong, if you cannot wrap it out, rise your hand and I will come to your group. What is potential energy? Give example. Energy that is stored in objects, energy that is stored in food, fuels and batteries What is kinetic energy? energy in a moving object What energy allow the ball to Potential energy move away? During its movement, what energy is in the ball? Kinetic energy Where does this energy come from? potential energy When the potential energy is bigger it’s bigger how is the kinetic energy in the ball? According to our experiment in catapult, mention two things that make potential energy in the catapult bigger. longer throwing stick (stick that throws the ball) or more popsicle sticks to make the throwing stick higher complete your WB page 16 to 17. Please read the procedure carefully and follow it properly. 15 minutes to do this. 1. According to your experiment, how the height of the ramp affects the distance travelled by a toy car? Why is this so? the higher the ramp the further the car travelled; because the higher the ramp, the more potential energy that is stored in the car 2. At which point on the ramp does a toy car have the least gravitational potential energy? How do you prove this? At the lowest height of the ramp, the car travelled in the shortest distance when the height of the ramp at its lowest point, this prove that the energy stored in the car at this point is the least 3. how potential energy different with kinetic energy? potential energy is energy that is stored in objects, kinetic energy is found in moving objects