Theme 11 - Rotatioanal Motion

Question 1

State the definition of angular position (1)

Answer 1

• the angle measured from the reference line

Question 2

What is the sign conventions for angular position (2)

Answer 2

If angle greater than 0 = anti clockwise rotation from reference line
If angle less than 0 = clockwise rotation from reference line

Question 3

What does 1 revolution mean (1)

Answer 3

360 degrees

Question 4

State the formula for arc length (1)

Answer 4

Arc length = radius x angle

Question 5

State the definition of average angular velocity (1)

Answer 5

W = change in angular velocity / change in time

Si unit = rad/s

Question 6

State the definition of instantaneous angular velocity (1)

Answer 6

Lim t=0 change in angular position / change in time

Question 7

State the definition of period (1)

Answer 7

2 x pie / angular velocity

(W) is angular velocity

Question 8

State the definition of average angular acceleration (1)

Answer 8

= change in angular velocity / change in time

Si unit = s -2

Question 9

State the definition of instantaneous angular position (1)

Answer 9

Lim t=0 change in angular velocity / change in time

Question 10

State the equation when angular acceleration is constant (1)

Answer 10

V = u + at

Question 11

State the equation of tangential speed of a rotating object (1)

Answer 11

V = radius x angular velocity

Si unit = m/s

Question 12

State the formula for centripetal acceleration of a rotating object (1)

Answer 12

A = radius x angular velocity^2

Si unit = m/s^2

Question 13

State the formula for tangential acceleration of a rotating object (1)

Answer 13

A = radius x angular acceleration

Si unit = m/s^2