Orbital Motion

Question 1

A centripetal force causes circular motion because it accelerates an object

Revolt · Accepted Answer

toward the center of a circle, which changes the direction of motion but not the speed.

Question 2

A child on a spinning playground ride is 0.36 m from the center of the ride. The centripetal force on the child is 19 N.

Revolt · Accepted Answer

23 kg

Question 3

An object is represented by the dot on the motion map.

Revolt · Accepted Answer

a ball twirled on a string that just broke

Question 4

What is the direction of the centripetal force when applied to an object?

Revolt · Accepted Answer

perpendicular to an object’s motion

Question 5

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 6

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.

Question 7

Julius competes in the hammer throw event. The hammer has a mass of 7.26 kg and is 1.215 m long.

Revolt · Accepted Answer

6,100 N

Question 8

Suchita makes a table to identify the variables used in the equations for centripetal force.

Revolt · Accepted Answer

X: radiusY: tangential speed

Question 9

Scientists are making plans to put a probe in orbit around Earth. They want the probe to enter the orbit shown below.

Revolt · Accepted Answer

X

Orbital Motion Answers