Forces in Nature Test_Part 1

This graph shows the change in the force of gravity as distance increases. The graph will never reach zero, which suggests that

• gravity cannot cross space.

• the force of gravity does not change regardless of distance.

• every object exerts gravitational force on every other object.

• more distant objects exert a stronger gravitational force on other objects.

The path of a meteor passing Earth is affected by its gravitational force and falls to Earth's surface. Another meteor of the same mass falls to Jupiter's surface due to its gravitational force. What statement accurately compares these two events?

• The meteors fall at the same rate since they have the same mass.

• The meteor falls to Earth faster due to its greater gravitational force.

• The meteor falls to Jupiter faster due to its greater gravitational force.

• The meteor falls to Jupiter at a faster rate due to its thinner atmosphere.

During this experiment, a positively charged rod is brought near but not touching the electroscope. The presence of the charged object above the plate of the electroscope induces charges to move down into the gold leaves, giving the electroscope an overall positive charge. The positive leaves repel.

Which statement(s) in the prompt is/are key to explaining why the plate at the top of the electroscope contains negatives charges?

I. Like charges repel.

II. Opposite charges attract.

III. Metals are good conductors.

IV. Attractive forces decreases with distance.

• II

• III

• IV

• I and IV

If you hold a balloon by a string and the balloon moves toward your sweater and sticks there, what would you infer?

• That the balloon and the sweater have no charges.

• That the balloon and the sweater have like charges

• That the balloon and the sweater have neutral charges.

• That the balloon and the sweater have opposite charges.

Four students are investigating how a positively charged steel sphere affects how the charges of two touching steel spheres are distributed. Each student creates a diagram as a hypothesis.

Which student’s diagram correctly predicts the distribution of charges?

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A balloon has a negative charge. A glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?

• The balloon will be repelled by the rod.

• The balloon will be attracted to the rod.

• The balloon will remain in place.

• The balloon will spin in circles.

The drawstring shows two uncharged lightweight plastic balls suspended by thin, insulating threads. Ball 1 is given a positive charge. Ball 2 is given an equivalent negative charge.

Which diagram best shows how the balls will react after becoming charged?

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A positively charged ball is placed an equal distance between two charged objects, Object 1 and Object 2. In which case will the positively charged ball move toward Object 2?

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Susie rubbed the plastic wand with a silk cloth. She brought the wand close to the top of the electroscope. Note what happened when she did this. How did Susie make the initial static charge that started this process?

• magnetism

• induction

• electrical current

• friction

Wires used in the cables of household gadgets have a plastic covering. This is because

• absorb heat well.

• can be bent to any shape.

• are cheaper than other cover materials.

• are poor conductors of electricity.