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By which two ways can objects be made more stable?
 a wider base
 a lower centre of mass

How can you find the centre of mass of a symmetrical object?
 Find where the lines of symmetry intersect

How can you find the centre of mass of an asymmetrical object?
 Suspend it from any two points and draw vertical lines from the suspension points. The centre of mass will be where the drawn lines intersect.

What is meant by the time period of a simple pendulum?
The time for one complete swing back to the starting position.

What is the relationship between the time period of a pendulum and its frequency?

What does the time period of a pendulum depend upon?
The length (from the pivot to the centre of mass)

What is the unit of frequency?
Hertz (Hz) (cycles per second)

What is the turning effect of a force called?
The moment

What does the turning effect of a force depend upon?
 The size of the force
 The perpendicular distance of the force from the pivot
 (M = F x d)

If an object is not turning, what does it say about the total anticlockwise moment and the total clockwise moment?
They are balanced

Hydraulics use liquids. What property of liquids do they rely upon?
That they are virtually incompressible

In a liquid, which is transmitted equally in all directions: pressure or force?
Pressure

What is the Pascal (Pa) the unit of?
Pressure

In the equation
what does A represent?
The crosssectional area (in metres squared)

In which direction does centripetal force act?
 Towards the centre of the circle

What is the force called that keeps objects moving in a circle?
 Centripetal force

What 3 things increase the size of the centripetal force required to keep objects moving in circular motion?
 Increased mass
 Increased speed
 Reduced radius


