Unit 2 Practice Test

Which of the four fundamental fources is the strongest?

• strong nuclear

• gravity

• electromagnetic

• weak nuclear

Which produces more energy: nuclear fusion or nuclear fission?

• nuclear fusion

• nuclear fission

If a positively charged object was brought near a negatively charged object, what would happen?

• they would attract

• they would repel each other

• they would not interact

If I double the amount of mass on two objects, how does that affect the gravitational force?

• x2 (doubles)

• x4 (quadruples)

• 1/2 (halves)

• 1/4

Answer explanation

There are two masses that are both doubled. 2*2 =4

Why can two objects near touch?

• They can touch

• Gravitational forces

• Electrostatic forces

• Forces are not strong enough

Answer explanation

Like charges repel, so what we feel is actually the repulsion or "pushing away" of the atoms.

According to Kepler's Law

• orbits are perfect circles

• orbits are elliptical

• orbits are different for each planet

• We don't know the shape of orbits

What is an orbital period?

• One "day" on a planet

• The time it takes for the planet to rotate

• The time it takes for a planet to finish an orbit

• none of the above

Answer explanation

hint: orbital

What units do we use to measure charge?

• N

• F

• r

• C

Which of these is the constant in Coulomb's Law?

• k

• r

• G

• m

Which of these are the constant in Newton's Law of Universal Gravitation?

• k

• F

• G

• m