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Falling Balls >> How Things Work: An Introduction to Physics

The force you exert on a bathroom scale as you stand on that scale.

The force that a bathroom scale exerts on you as you stand on that scale.

The force you exert on a trampoline as you land on that trampoline after jumping high above the trampoline’s surface.

The force that causes you to accelerate downward when you are high above the surface of a trampoline.

Hold each ball motionless in your hand and choose the one that requires the largest upward force to keep it from falling.

Drop each ball from rest at the same height and choose the one that reaches the ground in the shortest time.

Drop each ball from rest at the same height and choose the one that reaches the ground in the longest time.

Roll each ball down the alley toward the bowling pins and choose the ball that moves fastest.

While still on the spaceship in deep, gravity-free space, how can you identify the ball that will be heaviest when your cruise ship lands on a planet and gravity is present? [Neglect any effects due to air]

1 point

Hold each ball motionless in your hand and choose the one that requires the largest upward force to keep it from falling.

Throw each ball down the alley toward the bowling pins and choose the ball that moves fastest.

Throw each ball down the alley toward the bowling pins and choose the ball that slows down the most (that undergoes the greatest decrease in forward velocity).

Shake each ball rapidly back and forth, and choose the ball that accelerates the least in response to the same force as on Earth.

less weight and falls more slowly than on Earth. It undergoes the same acceleration as on Earth when exposed to the same force as on Earth.

less weight and falls more slowly than on Earth. It accelerates more rapidly than on Earth when exposed to the same force as on Earth.

the same weight, but falls more slowly than on Earth. It accelerates more slowly than on Earth when exposed to the same force as on Earth.

the same weight and falls at the same rate as on Earth. It accelerates more slowly than on Earth when exposed to the same force as on Earth.

1/2 the distance down from the cliff top to the water.

1/4 the distance down from the cliff top to the water.

3/4 the distance down from the cliff top to the water.

Slightly above 1/2 the distance down from the cliff top to the water. In other words, about a meter (3 feet) closer to the cliff top than to the water.

Downward.

Toward the basket.

Toward a point slightly above the basket.

Toward a point slightly below the basket.

7.You throw a handful of different coins up and forward and watch them arc through space. They leave your hand at the same moment and with the same starting velocity. Neglecting any effects due to air, where and when do those coins hit the level ground in front of your feet? [Note: air can significantly affect fast-moving coins. If you want to test your answer experimentally, be careful to minimize those air effects. Also, be safe!]

1 point

All the coins hit the ground at the same time and at the same distance from your feet.

The heavier coins hit the ground before the lighter coins, but they all hit the ground at the same distance from your feet.

The heavier coins hit the ground before the lighter coins and they hit the ground farther from your feet than do the lighter coins.

All the coins hit the ground at the same time, but the heavier coins hit the ground farther from your feet than do the lighter coins.

The vase’s velocity was zero. The vase’s acceleration was the acceleration due to gravity, which is not zero.

The vase’s velocity was the velocity due to gravity, which is not zero. The vase’s acceleration was zero.

The vase’s velocity was zero. The vase’s acceleration was zero.

The vase’s velocity was the velocity due to gravity, which is not zero. The vase’s acceleration was the acceleration due to gravity, which is not zero.

The archer must still aim above the target’s bullseye, but less far above the bullseye than with the slower-moving arrow.

The archer must aim exactly as before.

The archer must now aim exactly at the target’s bullseye.

The archer must still aim above the target’s bullseye, but farther above the bullseye than with the slower-moving arrow.

The bottle coasted horizontally outward as it fell vertically.

The counter pushed the bottle horizontally outward as the bottle fell vertically.

The bottle pushed itself horizontally outward as it fell vertically.

The direction of the net force on the falling bottle was at an angle between outward and downward, so the bottle moved outward and downward.

Falling Balls >> How Things Work: An Introduction to Physics

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