Module 5.2

Question 1

Angular Velocity

Answer 1

An object’s rate of change of angular position

Question 2

Centripetal Acceleration

Answer 2

The acceleration of an object moving in circular motion.
Any object in circular motion must have an acceleration since the direction of the
object, and therefore the velocity of the object, is constantly changing

Question 3

Centripetal Force

Answer 3

The resultant force responsible for an object moving in circular
motion. Centripetal forces always act towards the center of the object’s rotation

Question 4

Frequency

Answer 4

The inverse of time period. The number of rotations per unit time

Question 5

Period

Answer 5

The time taken for one whole rotation

Question 6

Radian

Answer 6

A unit of angle, where 2π equal to one complete angular rotation.

Question 7

frequency for circular motion

Answer 7

The frequency, f,
measured in Hertz (Hz) is the number of full circles completed in one second

Question 8

the formula for angular velocity

Answer 8

𝜔 = 𝜃/𝑡
𝜃 - the angle the object has travelled through in the time t. Measured in rad

Question 9

What force is the centripetal force

Answer 9

The resultant force so if there are multiple forces have to resolve them

Question 10

How to investigate circular motion

Answer 10

• Circular motion can be investigated experimentally by tying a
  bung, with mass m, to a piece of string, and threading it through
  a glass tube. The other end of the string has a weight, with mass
  M, suspended from it

-This provides the centripetal force, F =
Mg, as the tension throughout the string is constant.

• The string is
  whirled in a circle, and the time taken for a complete rotation is
  recorded. The mass of the weight is altered and the experiment
  repeated.
• use Mg = (mv^2) / r
• By measuring the radius of the circle and using the time for one complete oscillation, the
  velocity can be determined. When v2 is plotted against M, a straight line graph which passes
  through the origin should be produced