8. Centripetal Forces & Gravitation

A car of mass $m$ travels over the top of a hill with radius of curvature $r$. What is the maximum speed $v$ the car can have at the top of the hill without losing contact with the road (i.e., without flying off)?

According to Newton's Law of Gravity, into which of the following stable force fields can a proton be placed at rest without experiencing a force?

Why is it important to use a scale model when describing the solar system?

According to Newton's Law of Gravity, which of the following changes would increase the gravitational force between two objects? $F=\frac{G{m}_1{m}_2}{r^2}$

According to Newton's Law of Gravity, how does increasing the mass of one of two objects affect the gravitational force between them? $F=\frac{G}{r}{m}_1{m}_2$

According to Newton's Law of Gravity, how does the gravitational force between two objects change as the distance between them increases?

According to Newton's Law of Gravity, how does the gravitational force between two objects change as the distance between them increases?

According to Newton's Law of Gravity, the magnitude of the gravitational force between two objects depends on which of the following factors? $F=\frac{G{m}_1{m}_2}{r^2}$

According to Newton's law of universal gravitation, which of the following statements is true?

According to Newton's Law of Gravity, what happens to the gravitational force between two masses as the distance between them decreases?

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 $F_g=\frac{G{m}_1{m}_2}{r^2}$.