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

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شرح ساينس رابعة ابتدائي - ترم أول
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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".
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