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# Airplanes vs. Rockets: - PowerPoint PPT Presentation

Airplanes vs. Rockets:. Airplanes vs. Rockets:. What are the principles of flight for planes and rockets?. Principles of flight: airplanes. What causes airplanes to fly?. Principles of flight: airplanes. What causes airplanes to fly? Bernoulli’s Principle:. Principles of flight: airplanes.

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Presentation Transcript

### Airplanes vs. Rockets:

What are the principles of flight for planes and rockets?

• What causes airplanes to fly?

• What causes airplanes to fly?

• Bernoulli’s Principle:

• What causes airplanes to fly?

• Bernoulli’s Principle: As the speed of a moving fluid increases, the pressure within the fluid decreases.

• What causes airplanes to fly?

• Bernoulli’s Principle: As the speed of a moving fluid increases, the pressure within the fluid decreases.

• Faster flowing air has less pressure so an object will be pushed in the direction of the fast moving air by the normal air pressure on the other side.

• Why does the air speed change?

Direction of travel for the plane

• Why does the air pressure change?

• Why does the air plane go up?

• Rockets do not use Bernoulli’s principle for take off.

• Rockets do not use Bernoulli’s principle for take off.

• Instead they utilize Newton’s Third Law.

• Rockets do not use Bernoulli’s principle for take off.

• Instead they utilize Newton’s Third Law.

• Newton’s Third Law states that every action has an equal and opposite reaction.

• What needs to happen to achieve orbit?

• What needs to happen to achieve orbit?

• To achieve and maintain an orbit there needs to be a balance between the force of gravity between the two objects and the orbiting object’s inertia.

• What needs to happen to achieve orbit?

• Inertia (Newton’s 1st law): States that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an outside force.

• What needs to happen to achieve orbit?

• Inertia (Newton’s 1st law): States that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an outside force.

• Increasing speed increases inertia.

Gravity

Gravity

If speed equals gravity

you are in a constant orbit.

Gravity

Gravity

If speed is less than

Gravity you are in a

decaying orbit (crashing

or landing).

Gravity

Gravity

If speed is more

than gravity you are

leaving orbit (going

to the moon).