# Physics Help >> Index to Physics Homework Help »Circular Motion Quiz 1

 New Problems reloads the page with new variable values in all questions. You must do this after grading the test to rework it another time. Make sure to enter your answers in the specified units .

Clear the form (can not be undone) and

 1
A ball is rolled along a track that turns into a vertical loop. If the radius of the loop is cm, what is the minimum speed in m/s the ball must have at the top of the loop to maintain contact with the loop?

 2
A boy swings a kg stone in a horizontal circle with a radius of m. The string breaks under N of tension. What is the maximum speed (in m/s) the stone can have?

 3
A car traveling along a level curve with a radius of curvature of m hits a patch of ice where the coefficient of friction is . Above what speed (in m/s) will the car skid?

 4
A mass on the end of a m string moves at revolutions per second. What is the magnitude of the centripetal acceleration in m/s/s?

 5
Determine the minimum angle at which a curve should be banked so that a car traveling at m/s can safely negotiate the curve if the radius of the curve is m.

Once you have submitted your answers for grading by clicking the grade button, you cannot resubmit answers for the same Problem Set--you must use the 'New Problems' button first.