8. Centripetal Forces & Gravitation

If two long straight wires are parallel and carry equal currents in the same direction, what is the nature of the force between them according to Newton's Law of Gravity?

Which of these principles is primarily responsible for the gravitational attraction between two masses?

According to Newton's Law of Gravity, the two forces acting on a skydiver during free fall are $\mathrm{gravity}$ and air $\mathrm{resistance}$. Which pair correctly fills in the blanks?

Which fundamental force is responsible for keeping the Earth in orbit around the Sun?

According to Newton's Law of Gravity, which of the following objects would exert the strongest gravitational pull on another object at a fixed distance ($r$)? The gravitational force is given by $F_g=\frac{G{m}_1{m}_2}{r^2}$.

According to Newton's Law of Gravity, what force is primarily responsible for keeping planets in the solar system from moving in straight lines through the galaxy? $F=\frac{\mathrm{G\; m\_1\; m\_2}}{r^2}$

According to Newton's Law of Gravity, what is the approximate value of the acceleration due to gravity at Earth's surface ($g$)?

Which statement best compares the gravitational force and the strong force?

Which of the following best describes what is meant when we say that the $\mathrm{Sun}$ is in gravitational equilibrium?

Which of the following best explains why the north pole of a compass needle points toward Earth's geographic north pole?

Which of the following statements about the force of gravity is false?

Which statement correctly compares the acceleration due to gravity on $Earth$ and on the $Moon$?