Further Mechanics

Question 1

Angular displacement

Answer 1

In circular motion, the angle turned through. Measured in radians or
degrees

Question 2

Angular velocity

Answer 2

The angular displacement per unit time, measured in radians or degrees
per second. It is different from angular speed as it is defined in either a clockwise or
anticlockwise direction.

Question 3

Centripetal acceleration

Answer 3

As a body follows an orbit its direction constantly changes, this
produces a constantly changing velocity and the centripetal acceleration is needed to cause
this change in velocity.

Question 4

Conservation of momentum

Answer 4

In a closed system with no external forces the momentum of
the system before an event is equal to the momentum of the system after the event.

Question 5

degrees to radian

Answer 5

xπ/180

Question 6

radian to degrees

Answer 6

x180/π

Question 7

angular velocity ω and its unit

Answer 7

angular displacement/ time
ω=Δθ/Δt
OR
ω=2πf
=V/r

in rads^-1

Question 8

For circular motion

Answer 8

Force is constantly acting at 90 degrees to the objects velocity, towards the centre of the circle

Question 9

SHM described by a graph

Answer 9

-straight line through gradient = y and x are directly proportional so acceleration and displacement are too
-negative gradient so acceleration is directed towards the equilibrium position