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**9**

When lift is greater, the helicopter

A. climbs down.

climbs up.

hovers in midair.

None of the above

Newton’s Third Law

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Slide 69

When lift is greater, the helicopter

A. climbs down.

climbs up.

hovers in midair.

None of the above

Newton’s Third Law

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Slide 70

A bird flies by

A. flapping its wings.

pushing air down so that the air pushes it upward.

hovering in midair.

inhaling and exhaling air.

Newton’s Third Law

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Slide 71

A birds flies by

A. flapping its wings.

pushing air down so that the air pushes it upward.

hovering in midair.

inhaling and exhaling air.

Newton’s Third Law

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Slide 72

Slightly tilted wings of airplanes deflect

A. oncoming air downward to produce lift.

oncoming air upward to produce lift.

Both of these.

Neither of these.

Newton’s Third Law

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Slide 73

Slightly tilted wings of airplanes deflect

A. oncoming air downward to produce lift.

oncoming air upward to produce lift.

Both of these.

Neither of these.

Explanation:

When a wing diverts air downward, it exerts a downward force on the air. The air simultaneously exerts an upward force on the wing. The vertical component of this upward force is lift. (The horizontal component is drag.)

Newton’s Third Law

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Slide 74

Compared with a light-weight glider, a heavier glider would have to push air

A. downward with greater force.

downward with the same force.

downward with less force.

none of the above

Newton’s Third Law

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Slide 75

Compared with a light-weight glider, a heavier glider would have to push air

A. downward with greater force.

downward with the same force.

downward with less force.

none of the above

Explanation:

The force on the air deflected downward must equal the weight of the glider.

Newton’s Third Law

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- Newton’s First Law of Motion
- Inertia in Action
- Newton’s Second Law of Motion
- Forces and Interactions
- Newton’s Third Law of Motion

- Madame Marie Curie
- Waves & Sound
- Newton’s law of universal gravitation
- Ch 9 Nuclear Radiation
- Upcoming Classes
- Motion
- Radioactivity and Nuclear Reactions

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