Which of the following statements best explains why the plunger can move in the syringe barrel?

• There is less air pressure outside the syringe.

• The air inside the syringe is being compressed.

• There is greater air pressure outside the syringe.

• The air inside the syringe is being pulled downward by gravity.

If Marcel blows air over the top of the paper, it will most likely

• lift up because there is an area of low pressure below the paper

• lift up because there is an area of low pressure above the paper

• remain still because there is an area of low pressure below the paper

• remain still because there is an area of low pressure above the paper

While observing penguins at the zoo, Jeremy explained to his brother that the enclosure does not have a roof because penguins cannot fly. Jeremy explained that a penguin cannot fly because

• drag forces created by body shape prevent flight

• thrust forces cannot be generated by their leg muscles

• the force of gravity is less than the lift force that their wings can generate

• the force of gravity is greater than the lift force that their wings can generate

Swifts are birds that have physical characteristics such as cone-shaped heads and long, tapered wings. These characteristics help swifts fly quickly and for long distances.

The physical characteristics described above mainly allow the swift to

• increase both lift and drag

• decrease both lift and drag

• increase lift and decrease drag

• decrease lift and increase drag

Which part of an airplane has a function that is most similar to the function of a bird’s

chest muscles in flight?

• Engine

• Rudder

• Aileron

• Fuselage

Which of the following graphs most accurately represents the mass of oxygen in the sealed jar before, during, and after the candle burns?

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7. Which of the following cycling positions would be the most efficient for reducing drag forces?

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The observed airplane should be classified as

• Group II

• Group III

• Group V

• Group VI

Which of the following physical characteristics of a bird function most like the elevators of

an airplane?

• Tail feathers

• Pointy beaks

• Curved wings

• Chest muscles

Parachutes reduce the speed of a falling object by

• increasing drag forces acting on the object

• decreasing drag forces acting on the object

• increasing the force of gravity acting on the object

• decreasing the force of gravity acting on the object