Circular Motion, Gravitation, and Kepler's Laws

What are the two basic types of circular motion that we are taking notes on this week? Select the two that apply.

• Uniform circular motion

• Nonuniform circular motion

• Sporadic circular motion

• Linear circular motion

For an object to undergo uniform circular motion, its velocity must have a constant magnitude but a direction that is always changing. In other words, the object is experiencing a continuous acceleration. What is the direction of this continuous acceleration for uniform circular motion?

• Its direction is pointed inwards towards the center of the circular path being traversed by the object

• Its direction is pointed outwards away from the center of the circular path being traversed by the object

• Its direction is tangential to the circular path being traversed by the object

• Its direction is perpendicular to the circular path being traversed by the object

Which formula is used to calculate the magnitude of the centripetal acceleration that an object experiences when the object is undergoing uniform circular motion?

Match the following

• Centripetal force

• Centripetal acceleration

• Speed

• Mass

• Radius of circular path

Tags

NGSS.HS-PS2-1

A 0.575 kg ball at the end of a string is swinging in a horizontal circle of radius 0.621 m. The ball makes exactly 4.00 revolutions in a second. What is the magnitude of its centripetal acceleration (a_c)?

• a_c = 392 m/s/s

• a_c = 251 m/s/s

• a_c = 652 m/s/s

• a_c = 233 m/s/s

Tags

NGSS.HS-PS2-1

A 0.575 kg ball at the end of a string is swinging in a horizontal circle of radius 0.621 m. The ball makes exactly 4.00 revolutions in a second. What is the magnitude of its centripetal force (F_c)?

• F_c = 225 N

• F_c = 144 N

• F_c = 375 N

• F_c = 134 N

Tags

NGSS.HS-PS2-1

For an object undergoing circular motion, what is the period (T) defined as?

• The time it takes for the object to complete one full cycle of the circular path/orbit

• The time it takes for the object to complete one half-cycle of the circular path/orbit

• The time it takes for the object to accelerate

• The time it takes for the object to change direction

Tags

NGSS.HS-PS4-1

Match the following

• The mass of object 2

• The gravitational force

• The mass of object 1

• The gravitational constant

• The radial distance between the centers of objects 1 and 2

Tags

NGSS.HS-PS2-4

What is the currently accepted value for the gravitational constant (G)?

• 6.67 × 10^-11 N · m²/kg²

• 9.11 × 10^-31 N · m²/kg²

• 8.99 × 10⁹ N · m²/kg²

• 6.63 × 10^-34 N · m²/kg²

Tags

NGSS.HS-PS2-4

Who was the first person to measure the gravitational constant (G)?

• Isaac Newton

• Henry Cavendish

• Humphry Davy

• Galileo Galilei

• Johannes Kepler

Tags

NGSS.HS-PS2-4