Unit 2 Forces In Nature Study Guide

Between which pair of objects would the LARGEST gravitational attraction be found? Assume there is an equal distance between the first and second items mentioned in all four answer choices?

• person and earth

• an ant and earth

• person and small bird

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Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you then hold the comb near your hair, strands of hair appear to move forward and ”stick to the comb.” This is because the hair and the comb –

• attract each other because they have opposite charges.

• attract each other because they have the same charges

• repel each other because they have opposite charges.

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If you have ever used a compass, you know that it can be used to help navigate. It does this with a needle that always points north, so you know which direction you are heading.

Why does a compass needle point north?

• Due to the influence of the earth's magnetic field.

• Due to the influence of the earth's electric field.

• Due to the direction of the earth's orbit.

You may have seen what a magnet will do to iron filings, arranging them into specific patterns like the one you see here. This arrangement is due to the ____________ that is produced by the magnet.

• magnetic field

• force field

• vibration

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An astronaut leaves the International Space Station (ISS) on a tethered line. Although ISS and Earth exert gravitational force on the astronaut, why does she appear to be weightless?

• Because the astronaut is in free fall.

• The mass of the astronaut is insufficient to be affected by gravity.

• Earth only exerts gravitational force on objects at its surface.

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Steve touched the Van de Graaff generator and all his hair stood on end. The charge from the generator was transferred to Steve's hair so all of the strands had the same + charge. His hairs all repelled each other and stood on end as you see here. This illustrates what law?

• law of attraction

• law of electrons

• law of electricity

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You can watch static electricity in action by rubbing an inflated balloon against your hair. Your hair will actually stand on its end! It does this because each hair becomes charged, and they all repel one another.

However, eventually, your hair will return to normal. Why is this?

• The charge accumulated in your hair is eventually transferred to the surrounding environment.

• The charge accumulated in your hair is eventually broken down by the nuclear force.

• The charge accumulated in your hair is eventually converted to neutral particles

Which statement describes what will happen when the needle first touches the cylinder?

• Electrons will flow from the needle to the cylinder through conduction.

• The needle will become positively charge through friction.

• Repulsion between the needle and the cylinder will keep them from actually touching.

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You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to

• positively charged hair.

• 
  the neutrally charged wall.

• a piece of metal.

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A student is investigating how a negatively charged rubber rod affects charges distributed on two positively charged steel spheres that are in contact, as shown in the diagram below.

Which process will occur between the two spheres?

• Conduction, because they are touching.

• Insulation, because they are not touching.

• Friction, because one material is being rubbed on another.

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