Lesson 6: Orbital Motion

Question 1

Which motion maps show an object in uniform circular motion? Check all that apply.VWXYZ

Revolt · Accepted Answer

V; W; Y

Question 2

gravityinertiacentripetal forcecentrifugal force

Revolt · Accepted Answer

inertia

Question 3

Johanna makes the table below to organize her notes about centripetal forces.Which type of force should she place in the cell marked X?

Revolt · Accepted Answer

gravity

Question 4

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s.

Revolt · Accepted Answer

23 N

Question 5

Without inertia, how would an object that is experiencing a centripetal force behave?

Revolt · Accepted Answer

It would move in a line toward the circle’s center.

Question 6

A remote-controlled plane has a mass of 0.386 kg and flies in a circle with a radius of 75 m. The centripetal force on the plane is 4.0 N.

Revolt · Accepted Answer

28 m/s

Question 7

A wrecking ball has a mass of 650 kg. It swings from a cable that is 21 m long. The centripetal force on the ball is 56 N.

Revolt · Accepted Answer

1.3 m/s

Question 8

How does a centripetal force cause circular motion?

Revolt · Accepted Answer

It acts at a right angle to the object’s motion and causes the object to constantly change direction.

Lesson 6: Orbital Motion Answers