5.2 Circular Motion Flashcards Preview

OCR A Physics A Level > 5.2 Circular Motion > Flashcards

Flashcards in 5.2 Circular Motion Deck (7):
1

Radian

A measure of angle where 2pi is a full circle

2

Period of an object in circular motion

Time taken to make a full rotation

3

Frequency

Rotations per second

4

Angular velocity

The angle an object rotates through per second

5

What causes an object to move in a circle

A constant net force perpendicular to the direction of motion

6

Speed of a rotating object

v=ωr

7

Procedure to investigate circular motion

Whirling bung experiment
Attach a bung to one end of a string and a weight to the other end. Feed the string through a glass tube so that the weight is hanging out the bottom. Mark on the string just where it leaves the top of the glass tube. Start spinning the bung in a horizontal circle at a pace that keeps the marked portion of the string in the same place right above the top of the glass tube. Record the time taken for 10 rotations and then calculate the time period. use F = mrω^2 to find the centripetal force. This should be the same as the weight on the string.