Segment 3 Test: Forces at a Distance

The original goal of Henry Cavendish's experiment was to measure

• The mean density of the Earth
• The universal gravitational constant
• The effect of air currents on experiments
• The mass of very small and large objects

Which of the following best describes "universal gravitation"

• Only large items experience gravity
• Gravity only happens if you are a planet
• Everything with mass is attracted to everything else with mass
• Like charges repel, opposite charges attract

One procedure Henry Cavendish used to minimize the effect of air currents in his experiment was...

• Standing in the same room as his machine
• Enclosing the machine as much as possible
• Waiting 3 hours between taking measurments
• Always turning the air conditioning to "low"

If your desk weighs 20 pounds on earth, if you moved the desk to Jupiter it would weigh...

• more
• less
• the same

An object becomes charged when the atoms in the object gain or lose

• protons
• neutrons
• electrons
• any of the above

According to Coulomb's law, the force between a pair of charged particles that are brought closer together

• decreases
• increases
• increases only if the charges are of the same sign.
• increases only if the charges are of opposite signs

When a pair of charged particles are brought twice as close to each other, the force between them becomes

• twice as strong
• it remains the same
• four times as strong
• half as strong

When dealing with electrical charges, like charges _______________

• attract each other
• repel each other

As two oppositely charged particles approach each other, what happens to the electrical force between them?

• Attractive force increases
• Repulsive force increases
• Magnitude of their charges increases
• Nothing

What variable do "Newtons" represent

• Force
• Electrostatic charge
• Distance
• Mass