AP Physics 1 - Unit 2b Review - Universal Gravitation, Spring Force, and Circular Motion

Which of the following correctly represents the magnitude of the gravitational force between two objects?

• |F_g| = Gm1m2/r^2

• |F_g| = Gm1m2/r

• |F_g| = G(m1+m2)/r^2

• |F_g| = Gm1m2*r^2

In Newton's Law of Universal Gravitation, what does 'r' represent?

• The radius of the larger object.

• The distance between the centers of mass of the two objects.

• The radius of the smaller object.

• The sum of the radii of the two objects.

What is the approximate value of the Gravitational Constant (G)?

• 9.8 m/s^2

• 6.67 x 10^-11 N·m^2/kg^2

• 3.0 x 10^8 m/s

• 1.60 x 10^-19 C

When two objects interact gravitationally, how do the forces they exert on each other compare?

• The forces are always directed away from each other and have different magnitudes.

• The forces are always directed toward each other and have different magnitudes.

• The forces are always directed toward each other and have the same magnitude.

• The forces are always directed away from each other and have the same magnitude.

What are the typical units used for gravitational field strength?

• Newtons per kilogram (N/kg)

• Meters per second squared (m/s²)

• Both N/kg and m/s²

• Kilograms per meter (kg/m)

What does a larger spring constant (k) indicate about a spring?

• The spring is easier to compress or expand.

• The spring has less resistance to changes in distance from equilibrium.

• The spring requires more force to compress or expand per meter.

• The spring's mass is negligible.

An object moving in a circular path at a constant speed still experiences centripetal acceleration because:

• Its speed is constantly changing.

• Its mass is constantly changing.

• The direction of its tangential velocity is constantly changing.

• It is experiencing a constant tangential force.

Which statement accurately describes centripetal force?

• It is a new fundamental force that acts on objects in circular motion.

• It is always directed outward from the center of the circular path.

• It is the net force acting in the direction towards the center of the circular path.

• It is always explicitly drawn as a separate force in a free-body diagram.