Non Contact Force Review

Which of the following forces can push (repel) and pull (attract)?

• Magnetic Force

• Electric Force

• Gravitational Force

• Both Magnetic and Electric Force.

• All Three, Magnetic, Electric and Gravitational Force.

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Iron filings and bar magnets are placed on a piece of paper. Explain the pattern on the diagram below. Where is the magnetic field the strongest?

• The magnetic field is only strong at the north pole

• The magnetic field is only strong at the south pole

• The magnetic field is strongest at the magnet’s poles.

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If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move if its tip is a north pole?

• Clockwise (to the right)

• Counter-clockwise (to the left)

• It will not move

• Need more information

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When placed at equal distances apart, the greatest gravitational attraction will be between two

• skateboards

• bowling balls

• school buses

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As the product of two objects' masses increases, the pull of gravity

• Increases
• Decreases
• Stays the same

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if mass of an object is doubled, force of gravitation will be

• a. halfed

• b. doubled

• c. increases 4 times

• d. no change

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The diagram below shows that ______________________.

• As distance increases, the electric force increases.
• As distance decreases, the objects become less attractive.
• Electric forces are only slightly affected by distance.
• As distance increases, the electric force decreases.

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Which answer best describes this image?

• The positive charge is repelling the negative charge.
• The blue charged object will repel the negatively red charged object.
• The positively charged red object will be attracted to the negatively charged blue object.

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If each object has the same mass, which pair has the strongest gravitational attraction?

• The first, because it appears to weigh the most.
• The first, because the arrows are thickest.
• The  second, because it has an even balance of weight and distance.
• The first, because the objects are closest together.

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What causes an object to become magnetic?

• scientists do not know why an object is magnetic but they can determine which materials are likely to become magnetic
• An object is magnetic based on its number of north and south poles
• The atoms within a magnet align in the same direction creating a magnetic domain
• it is simply based on the element of the object

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