Field Forces: Knowledge Check

Gravity is:

• a force that attracts objects toward each other

• a type of light energy

• a form of sound wave

• a chemical reaction

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The Law of Universal Gravitation states that all objects attract each other through gravitational force. The strength of the force depends on: (pg. 426)

• distance and mass

• distance only

• mass only

• distance and weight

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Weight is different from mass because: (pg. 427)

• Weight depends on gravity, while mass does not.

• Weight and mass are always the same.

• Mass depends on gravity, while weight does not.

• Weight is measured in kilograms, mass in newtons.

The equation we can use to measure the force of gravity of something on Earth is:

• F = m × g

• F = m / g

• F = g / m

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Look at the equation in question 3. Doesn’t this look familiar? Where have we seen it before?

• In the quadratic formula

• In the Pythagorean theorem

• In the area of a circle formula

• In the slope-intercept form

If you remove air particles and air resistance, and drop a feather and a bowling ball from a tall tower at the same time, how will they fall?

• They will fall at the same rate and hit the ground together.

• The bowling ball will fall faster than the feather.

• The feather will fall faster than the bowling ball.

• Neither will fall; they will float.

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Celestial bodies like large moons, planets, and stars are shaped into spheres because: (pg. 425)

• Gravity pulls matter equally toward the center from all directions.

• They spin rapidly, causing them to flatten into discs.

• Solar winds shape them into round forms.

• Their magnetic fields force them into spheres.

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Deimos has a different shape compared to our moon because:

(pg. 425)

• it is much smaller and lacks enough gravity to form a sphere

• it is made entirely of ice

• it is closer to the Sun than our moon

• it has a thicker atmosphere than our moon

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Mass impacts the strength of gravity by:

• Increasing mass increases the strength of gravity.

• Decreasing mass increases the strength of gravity.

• Mass has no effect on gravity.

• Gravity is only affected by distance, not mass.

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Distance impacts the strength of gravity in the following way:

• Gravity becomes weaker as distance increases.

• Gravity becomes stronger as distance increases.

• Gravity remains the same regardless of distance.

• Gravity fluctuates randomly with distance.