Circular Motion and Gravitation

If the radius of the string is 0.3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper?

• 9.4 m/s

• 6.8 m/s

• 11.7 m/s

• 3.5 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The red ball has radius r and tangential speed v and the radius of the green ball is 3r.

Determine the tangential speed of the green ball.

• 3v

• v/3

• v

• 9v

Given that the blue dot is moving at constant speed decide whether the following statement is True or false.

This object is accelerating

• True

• False

• Impossible to tell

Tags

NGSS.MS-PS3-1

Which direction does the unbalanced force point?

• outward at a 90 degree angle to the tangent

• At a 45 degree angle to the direction of motion

• Toward the center of the circular path

• in the same direction as the velocity.

We will call this force (orange arrow) that points towards the center the ________ force

• Centrifugal

• Centripetal

• Center pointing

• Inwards pointing

What is uniform circular motion?

• Motion at varying speeds in a circle

• Motion in a straight line

• Motion with increasing speed

• Motion at constant speed in a circular path

How is the period of circular motion defined?

• Time taken to complete half a circle

• Time taken to complete one full circle

• Time taken to reach maximum speed

• Time taken to stop

Which of the following describes angular velocity?

• Rate of change of linear velocity

• Rate of change of angle with respect to time

• Distance traveled per unit time

• Acceleration in a circular path

Which of these would successfully calculate angular speed?

Which of these would successfully calculate tangential speed?