DOL - Newtons Laws Rockets - 10.8 and 10.9

When a rocket is sitting on the launch pad before ignition, it stays at rest because:

• There is no gravity acting on it.

• No unbalanced force is acting on it.

• It has no mass yet.

• Air pressure is holding it down.

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If a small rocket and a large rocket both experience the same thrust force, which one will accelerate more?

• The larger rocket

• The smaller rocket

• They will accelerate the same

• It depends on gravity only

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As gases are expelled downward from a rocket engine, the rocket moves upward because:

• The gases push against the ground.

• Air lifts the rocket.

• The rocket pushes the gases down, and the gases push the rocket up.

• The engine creates lift by heating the air.

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During launch, if the rocket’s engines suddenly double their thrust while its mass remains constant, what happens to the rocket’s acceleration?

• It doubles

• It stays the same

• It is cut in half

• It depends only on gravity

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At high altitude, air resistance becomes very small. Which statement best describes how Newton’s Laws explain the rocket’s continued motion after its engines shut off?

• It stops immediately because no thrust acts on it.

• It keeps moving upward because of Newton’s First Law until gravity slows it down.

• It accelerates faster because there is no air resistance.

• It keeps accelerating because of Newton’s Third Law.

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