Bennett Mechanical Test Velocity and Gravity 3

Question 1

Why does a feather fall slower than a rock in normal air?

Accepted Answer

Air resistance affects the feather more

Answer

Air resistance has a greater slowing effect on the light, large-surface feather.

Question 2

A rock falls for 2 seconds. About how far does it travel (ignoring air resistance)?

Accepted Answer

About 20 meters

Answer

Distance equals ½gt², so ½ × 10 × 2² ≈ 20 meters.

Question 3

On the Moon, where gravity is about 1/6 of Earth's, a dropped object will fall how compared to Earth?

Accepted Answer

Slower

Answer

Weaker lunar gravity means a slower acceleration, so the object falls more slowly.

Question 4

An object moving at constant velocity has what acceleration?

Accepted Answer

Zero

Answer

Constant velocity means no change in speed or direction, so acceleration is zero.

Question 5

Which has greater velocity: a 10 kg ball at 5 m/s or a 2 kg ball at 5 m/s?

Accepted Answer

They have equal velocity

Answer

Velocity depends only on speed and direction, not mass, so both are equal.

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