Flight

What are examples of propulsion in animals?

• Flapping wings

• Soaring

• Gliding

• Laying down

Answer explanation

Flapping wings: Many birds, bats, and insects use flapping wings to fly. They move their wings up and down to create lift, which allows them to stay in the air and move forward.

Gliding: Some animals, like eagles and hawks, use their wings to glide through the air. They fly to a high point, spread their wings, and then glide down to a lower point. This allows them to cover long distances with minimal energy.

Soaring: Similar to gliding, soaring involves using air currents to stay in the air for long periods of time. Many birds, like vultures and albatrosses, use soaring to travel long distances without flapping their wings too much.

Powered flight: A few flying animals, like hummingbirds, can move their wings so fast that they create enough lift to hover in one place. This is known as powered flight, and it requires a lot of energy to maintain.

What is The force that causes the airplane to rise up and holds it in the air?

• Weight

• Force

• Lift

• Drag

Answer explanation

Lift: The force that causes the airplane to rise up and holds it in the air. It is created by the wings of the airplane, which push air down.

What are the two types of propulsion of an aircraft?

• Pulling

• Pushing

• Lift

• Thrust

Answer explanation

Pushing force is a type of force that pushes an object forward, while pulling force is a type of force that pulls an object forward.

Propeller-driven airplanes use a pushing force to move forward. The propeller spins around and moves air behind it, which generates thrust and moves the airplane forward. The direction of the thrust is aligned with the propeller's axis, which is usually horizontal and parallel to the ground.

Jet engines use a pulling force to move the airplane forward. They suck in air and compress it, then ignite it with fuel and expel it out the back of the engine at high speed. This creates a powerful jet of exhaust gases that moves the airplane forward. The direction of the thrust is opposite to the direction of the exhaust gases, which are usually directed downwards and backwards.

What does lift need to be greater than in order to fly?

• Weight/gravity

• Thrust

• Drag

• Nothing

What is propulsions?

• A means to push forward or drive an object forward. This force is important for animals and aircrafts to fly.

• Puling an object backwards.

• A force that converts energy into electricity.

• A turbine

What is not an example of a propeller?

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What is an example of pushing force (propulsion)?

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