Grade 4 | Science | First Term | 2025

Currently Playing: Truck Versus Airplane | Grade 4 | Unit 2 - Concept 1 - Lesson 1 | Science

شرح ساينس الصف الرابع الابتدائي لغات - الفصل الدراسي الأول شرح ساينس رابعة ابتدائي - ترم أول لينك تحميل الملزمة https://drive.google.com/file/d/1fQBH5e2HyZIlO9PuLxlou6TZ_1ff55Gu/view?usp=sharing لينك تليجرام https://t.me/mrahmedelbashagroup In This lesson: Did you think about how each of the objects above starts to move? ▌The objects above require a force to stop or move. This force could be a pushing force or a pulling force. ▌To move or to stop an object, the forces acting on this object must change. ▌We need energy to apply these forces to the objects, where : - The person in picture ❶ needs energy to push the car. - The person in picture ❷ needs energy to pull the suitcase. - The football player in picture ❸ needs energy to push the ball, while the goalkeeper needs energy to push against the ball to stop it. Truck Versus Airplane Truck versus jet airplane: The engines on a jet airplane are much more powerful than the engine in a truck. So, jet airplanes fly much faster than moving trucks. The Shockwave truck: - The truck in the opposite picture is called "the Shockwave." - The Shockwave truck contains three jet engines. How does the Shockwave move? How does the Shockwave stop? - The three jet engines make the Shockwave truck reach speeds more than 500 kilometers per hour. - The Shockwave is about five times faster than the normal trucks. - To stop the Shockwave, engineers install three parachutes in it, that the driver opens them to help slow down the Shockwave quickly. - The idea of parachutes is used in rocket designs. Making Things Move All objects around us cannot move without push and pull forces, where : Air force: -Air can provide enough force to move some objects such as: The wind blowing that can move the leaves of a tree. - Let's see how engineers prove that the force of air can move some objects like "a cart". بالتوفيق مستر احمد الباشا